20 Best Dreadlock Extensions For Men in 2023 Reviews and Buying Guide

2,447 Reviews Scanned

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1 8Inch 30Locs Synthetic Locs Extensions Dreadlock Extensions 0.6cm Afro Kinky Dreads Extensions for... 8Inch 30Locs Synthetic Locs Extensions Dreadlock Extensions 0.6cm Afro Kinky Dreads Extensions... No ratings yet
2 ADIASAI 0.4cm and 0.6cm Width 4-16 Inch 10-100 Strands Options 100% Human Hair Dreadlock Extensions... ADIASAI 0.4cm and 0.6cm Width 4-16 Inch 10-100 Strands Options 100% Human Hair Dreadlock...
3 DAIXI 0.6cm and 0.4 0.8cm Options Thickness 6-18 Inch 30 Strands 100% Real Human Hair Dreadlock... DAIXI 0.6cm and 0.4 0.8cm Options Thickness 6-18 Inch 30 Strands 100% Real Human Hair Dreadlock... No ratings yet
4 IXIMII 0.4 cm Real Human Hair Dreadlock Extensions 8 inch 20 Strands Full Handmade Permanent Locs... IXIMII 0.4 cm Real Human Hair Dreadlock Extensions 8 inch 20 Strands Full Handmade Permanent Locs... No ratings yet
5 Permanent Handmade Human Hair Dreadlock Extensions Dyeable Bleachable And Curlable 6 Inch 60 Strands... Permanent Handmade Human Hair Dreadlock Extensions Dyeable Bleachable And Curlable 6 Inch 60... No ratings yet
6 Leeven Thin 24 Inch Dreadlock Extensions 0.6 cm Width 20 Strands Natural Black Soft Hippie SE Dreads... Leeven Thin 24 Inch Dreadlock Extensions 0.6 cm Width 20 Strands Natural Black Soft Hippie SE...
7 WacanDan 100% Human Hair Dreadlock Extensions for Men/Women, 0.4cm Thickness 6 Inch 10 Strands Full... WacanDan 100% Human Hair Dreadlock Extensions for Men/Women, 0.4cm Thickness 6 Inch 10 Strands... No ratings yet
8 FREESHOW Dreadlock Extensions 6 Inch 30 Strands Synthetic Fiber Hair Handmade Permanent Afro Kinky... FREESHOW Dreadlock Extensions 6 Inch 30 Strands Synthetic Fiber Hair Handmade Permanent Afro... No ratings yet
9 Teresa 0.8cm & 0.6cm & 0.4cm Width 6-18 Inch 10, 20, 40, 70, 100 strands 100% Human Hair Dreadlock... Teresa 0.8cm & 0.6cm & 0.4cm Width 6-18 Inch 10, 20, 40, 70, 100 strands 100% Human Hair... No ratings yet
10 Cypsin 8inch 30 Strands 100% Human Hair Dreadlock Extensions, 0.4cm Width Full Handmade Loc... Cypsin 8inch 30 Strands 100% Human Hair Dreadlock Extensions, 0.4cm Width Full Handmade Loc... No ratings yet
11 8Inch Loc Extensions Human Hair 0.6CM 100% Real Dreadlock Extensions Human Hair Full Head Handmade... 8Inch Loc Extensions Human Hair 0.6CM 100% Real Dreadlock Extensions Human Hair Full Head... No ratings yet
12 Permanent Loc Extensions Human Hair 8inch 30 Strands 0.6cm Real Human Hair Dreadlock Extensions for... Permanent Loc Extensions Human Hair 8inch 30 Strands 0.6cm Real Human Hair Dreadlock Extensions... No ratings yet
13 Yuandai Dreadlock Extensions 0.2cm 6inch 50 Strands Handmade Permanent Synthetic Fiber Hair... Yuandai Dreadlock Extensions 0.2cm 6inch 50 Strands Handmade Permanent Synthetic Fiber Hair... No ratings yet
14 Dreadlock Extensions Human Hair 6 Inches 10 Locs 0.4cm Width Handmade Permanent Loc Extensions For... Dreadlock Extensions Human Hair 6 Inches 10 Locs 0.4cm Width Handmade Permanent Loc Extensions... No ratings yet
15 6 inch 30 Strands Loc Extensions Human Hair for Women/Men Can Be Dyed Bleached Curled 100% Full... 6 inch 30 Strands Loc Extensions Human Hair for Women/Men Can Be Dyed Bleached Curled 100% Full...
16 DAIXI 0.4cm Thickness 70 Strands 8 Inch 100% Real Human Hair Curly Wave Dreadlock Extensions for... DAIXI 0.4cm Thickness 70 Strands 8 Inch 100% Real Human Hair Curly Wave Dreadlock Extensions for... No ratings yet
17 Alishow 6-18 inch Loc Extensions Human Hair Dreadlock Extensions for Men/Women 100% Real Human Hair... Alishow 6-18 inch Loc Extensions Human Hair Dreadlock Extensions for Men/Women 100% Real Human... No ratings yet
18 Haredluck Omber Red Dreadlock Extensions 0.8cm Width 10 Inch 20 Strands 100% Human Hair Full... Haredluck Omber Red Dreadlock Extensions 0.8cm Width 10 Inch 20 Strands 100% Human Hair Full... No ratings yet
19 6 Inch 0.4cm Thickness Dreadlock Extensions Human Hair 60 Strands Locs Extensions Real Human Hair,... 6 Inch 0.4cm Thickness Dreadlock Extensions Human Hair 60 Strands Locs Extensions Real Human... No ratings yet
20 JISHENG Loc Extensions Human Hair 0.4 cm 8 Inch 30 Strands Dreadlock Extensions Human Hair for Men... JISHENG Loc Extensions Human Hair 0.4 cm 8 Inch 30 Strands Dreadlock Extensions Human Hair for... No ratings yet

SaleBestseller No. 1
8Inch 30Locs Synthetic Locs Extensions Dreadlock Extensions 0.6cm Afro Kinky Dreads Extensions for...
  • Ultra Soft Dreadlock Extensions: Our crocheted dreadlock extensions are handmade from synthetic Kanikalon kinky hair in the best quality, the loc...
  • Loc Extensions Feature: Just like real human hair dreadlock extensions, they are lightweight, soft, flexible, and super durable. They are 100%...
  • Easy to Install: the dread locs extensions can easily be added to existing locs for more length or extra volume. Besides our dreads extensions length...
  • Dreads Extensions Details: 30 strands locs extensions included each pack, 8inch lengths 6±0.5mm diameter. Sweet Gifts: beads, cuffs, bamboo crochet...
  • Tips:30-60 dreadlocks must be used for a whole head of hair. Though it`s not human hair dreadlock extensions, synthetic dreadlocks can be applied...
Bestseller No. 2
ADIASAI 0.4cm and 0.6cm Width 4-16 Inch 10-100 Strands Options 100% Human Hair Dreadlock Extensions...
  • Hair Material: 100% real human hair, 100% Unprocessed Permanent Locs Extensions. Can be bleached and dyed the color you want
  • Advantage: Human hair loc extensions 0.6cm thickness, Usually 60 strands can make a full head, Soft and Strong, Light Weight, Easy to Install
  • Packing: 10 locs/pack with dreadlocks crochet hook and rat tail comb. Can be trimmed to the length you want, and added to existing locs for natural...
  • Feature: Handmade Locs Extensions can be used for more than 12 months under normal care. Can be washed normally and they are safe for swimming
  • About ADIASAI: We are the first batch of manufacturers to produce locs extensions, with professional workers and skills. If you have any questions or...
Bestseller No. 3
DAIXI 0.6cm and 0.4 0.8cm Options Thickness 6-18 Inch 30 Strands 100% Real Human Hair Dreadlock...
  • ♥Hair Material: 0.4cm 0.6cm and 0.8 cm Thickness Dreadlocks, Made of 100% Human Hair, Soft, Light Weight and Natural, Can Be BLEACHED, Dyed, Curled...
  • ♥Advantage: Passed Burning and Dyeing Test Successfully. 100% Hand-made and 100% Human Hair Permanent Loc Extensions, Natural, Adequate Quality,...
  • ♥Packing: 10-100 locs/pack with Quality Dreadlocks Crochet Hook/Needle and Rat Tail Comb, Can be Trimmed to the Length you Want,Usually 30-60...
  • ♥Feature: These Dreadlock Extensions are EASY to use .You will Become Like a Superstar by Using it. It's also the Hairstyle of REGGAE and Hip-Hop...
  • ♥Easy to install: The Locs Can be Added to Existing Locs to Add Length or for Repairs on Broken Locs. And they Can Also Be Washed Normally and They...
SaleBestseller No. 4
IXIMII 0.4 cm Real Human Hair Dreadlock Extensions 8 inch 20 Strands Full Handmade Permanent Locs...
  • 【REAL HUMAN HAIR】💯Passed burning test.Full handmade by professional workers,good quality,natural looking and easy to install.
  • 【ADVANTAGE】💯While others are producing by machine,we insiste on full handmade.So our locs are soft,durable and flexible!Minimal shedding!No...
  • 【DIY】💯Shorten by cutting or lengthen by adding.The dreads can be dyed,bleached or curled just like your own hair.
  • 【PACKAGE】💯20 strands human hair dreadlocks (diameter 0.4cm/0.16inch,length 8 inch),Come with a comb and a needle.
  • 【FIT All】💯Make you stand out from the crowd.Suit for men,women,teens and kids in any season and occasion.
Bestseller No. 5
Permanent Handmade Human Hair Dreadlock Extensions Dyeable Bleachable And Curlable 6 Inch 60 Strands...
  • Enhance Your Look With 100% Handmade Human Hair Dreadlock Extensions - Full And Thick, Soft, And Healthy
  • Upgrade Your Hairstyle Game With These 0.4cm Width Loc Extensions - Add Length Or Repair Broken Locs
  • Get The Perfect Look With These High-Quality Human Hair Dreadlock Extensions - Cut Short And Styled To Suit Your Unique Style
  • Experience The Versatility Of 100% Human Hair Dreadlock Extensions - Can Be Dyed, Bleached, And Styled To Perfection
  • Complete Kit With Quality Dreadlocks Crochet Hook, Bead Rings, And Comb - Choose Your Perfect Look With 20 To 100 Strands And Enjoy Long-Lasting Style
Bestseller No. 6
Leeven Thin 24 Inch Dreadlock Extensions 0.6 cm Width 20 Strands Natural Black Soft Hippie SE Dreads...
  • 【Material】100% handmade high quality synthetic fiber dreadlock extensions, 0.6 cm wide, easy to install. Looks like human hair.
  • 【Package】20 strands of 24 inch long dreads, 4g/strand. one free crochet hook. Usually 40-50 strands can make a full head.
  • 【Advantages】Light weight and very soft, no odor, no itch, skin friendly, tight, long lasting, natural looking.
  • 【Tips】If you receive hair that is a little bent, you can straighten it by blowing it with hot air from a hair dryer.
  • 【Perfect after-sales service】If you have any questions, you can contact us through Amazon, we will reply you and solve it within 12 hours!
Bestseller No. 7
WacanDan 100% Human Hair Dreadlock Extensions for Men/Women, 0.4cm Thickness 6 Inch 10 Strands Full...
  • Hair Material: 100% real human hair, full hand-made permanent loc extensions, soft,natural, can be bleached and dyed and can be curled.
  • Advantage: 100% Hand-made permanent dreadlocks extensions, natural, tight, adequate quality, no smell, no shedding. You can cut, dye, do whatever and...
  • Easy to Install: Fluffy loose loc joints can be easily added to existing locs to add length or start loc journey. And they can also be washed...
  • Package: 10 strands/pack with dreadlocks crochet Needle and rat tail comb. Usually 60-70 strands can make a full head.
  • Durability: Handmade dreadlocks last a long time and require only regular cleaning and maintenance. We just need to treat them like our own hair.
Bestseller No. 8
FREESHOW Dreadlock Extensions 6 Inch 30 Strands Synthetic Fiber Hair Handmade Permanent Afro Kinky...
  • ✨Hair Material:100% Synthetic Fiber hair dreadlock extensions. It is characterized by softness, Light weight and Natural, Can be Bleached and Dyed
  • ✨Hair Features : 100% Handmade ,100% Synthetic Fiber Hair Permanent Loc Extensions,0.6cm thickness, Natural, Adequate Quality,And they can also be...
  • ✨Easy To Install :Our Locs Are Hand-Knitted By Professional Workers And Can Be Added To Existing Locs Or To Your Own Hair.It Can Be Connected To...
  • ✨Hair Feature : Soft, Natural, Realistic And Light Weight. No Bad Smell, Light Weight. The Top 3c Texture Of The Hair Will Be Very Easy To Install....
  • ✨Durability : These Loc Extensions Last a Long Time And Require Only Regular Cleaning And Maintenance.We Just Have To Treat Them Like Our Own Hair
SaleBestseller No. 9
Teresa 0.8cm & 0.6cm & 0.4cm Width 6-18 Inch 10, 20, 40, 70, 100 strands 100% Human Hair Dreadlock...
  • Loc Extensions Human Hair Material: 6-18 Inch 100% human hair dreadlocks for Black Women/Men/Kids. The dreadlock can Passed Burning test, guarantee...
  • Human Loc Extensions Style: These 0.8cm thick and natural dreadlock extensions can be dyed/bleached/curled and twisted depending on your preference of...
  • Loc Extensions Easy to Install: The dreadlock extensions human hair can be added to existing locs to add length or for repairs on broken locs. And...
  • Human Dreadlock Extensions Options: 10, 20, 40, 70, 100 strands/ pack with dreadlock crochet needle and comb.Usually 40-70 locs can make a full head....
  • Full Hand-made Permanent Loc Extensions, Adequate Quality, No Shedding, No Smell, No tangle. Require only regular cleaning and maintenance,We just...
Bestseller No. 10
Cypsin 8inch 30 Strands 100% Human Hair Dreadlock Extensions, 0.4cm Width Full Handmade Loc...
  • Hair Material: 100% Real Human Hair Dreadlock Extensions, Can Passed Burning test, Can Be Bleached Dyed Curled
  • Packing: 30 locs/pack with quality dreadlocks crochet hook/needle and rat tail comb, Usually 30-60 Strands Can Make a Full Head
  • Advantage: Human Hair Loc Extensions 0.4cm thickness, Soft and Strong, Light Weight, Easy to Install. Can be trimmed to the length you want
  • Feature: Handmade Dreadlock Extensions Can Be Washed Normally and They are Safe for Swimming. They can be last for more than 24 months under normal...
  • Application: Can be suit for men women teens&kids, Can be used for Parties, Performances, Travel, Daily use etc. It's also the Hairstyle of REGGAE and...
Bestseller No. 11
8Inch Loc Extensions Human Hair 0.6CM 100% Real Dreadlock Extensions Human Hair Full Head Handmade...
  • High-Quality Materials: Our Dreadlock Extensions are made with premium human hair, ensuring durability and a natural feel. lightweight and breathable...
  • More Color Options: We offer a diverse range of color options to meet the needs of different personalities and styles. From classic black and brown to...
  • Easy Installation and Long-Lasting Durability: Our Dreadlock Extensions are designed to be user-friendly and easy to install. No professional skills...
  • Long-Lasting Durability and Easy Maintenance: Our Dreadlock Extensions boast excellent durability, designed and crafted to withstand extended use...
  • Suitable for Various Occasions: Our Dreadlock Extensions are versatile and suitable for a wide range of occasions. Whether it's casual outings,...
Bestseller No. 12
Permanent Loc Extensions Human Hair 8inch 30 Strands 0.6cm Real Human Hair Dreadlock Extensions for...
  • 【Hair Material】:100% real human hair loc extensions,0.6cm thickness soft loc extensions human hair can be dyed and bleached, very easy to...
  • 【Advantage】:Loc Extensions Human Hair,Soft and healthy, no strange smell, light weight and Natural, real human hair dreadlock extensions for...
  • 【Easy to install】:Permanent Loc Extensions Human Hair can be added to existing locs to add length or for repairs on broken locs. it also can be...
  • 【Packing】:30 /60 strands dread extensions human hair with Dreadlocks extensions Crochet Hook /needle and comb ,Usually make a full head needs...
  • 【Durability】:Please wash gently before use and safe for swimming. We just have to treat them like our own hair,human dreadlock extensions can...
Bestseller No. 13
Yuandai Dreadlock Extensions 0.2cm 6inch 50 Strands Handmade Permanent Synthetic Fiber Hair...
  • ❤[Material] Synthetic Fiber hair, 0.2cm sizes, Synthetic Fiber hair braid, length 6 inches - 18 inches, suitable for black women/men/children
  • ❤[Easy to install] Loc extension Synthetic Fiber hair is easy to install, completely handmade permanent locks, Synthetic Fiber hair extensions can...
  • ❤[Features] handmade permanent locks, 0.2cm thick, can be bleached, dyed, curled, easy to install, long lasting, soft and natural.
  • ❤[Packaging] FREESHOW Extensions Human Hair comes in a variety of packaging sizes, 0.2cm thickness 50Pcs/Lot. you can choose the items according to...
  • ❤ [Instructions and Notes] hair extension braids need regular cleaning and maintenance, they last a long time, no odour, no tangles, it is...
Bestseller No. 14
Dreadlock Extensions Human Hair 6 Inches 10 Locs 0.4cm Width Handmade Permanent Loc Extensions For...
  • HighQuality Human Hair Material: The Dreadlock Extensions Are Made Of 100% Real Human Hair, Which Can Be Tested By Burning. The Hair Is Soft,...
  • Handmade And Permanent: Each Loc Extension Is 100% Handmade With a Thickness Of 0.4cm, Ensuring Adequate Quality. These Permanent Loc Extensions Can...
  • Easy To Install: The Locs Can Be Easily Added To Existing Locs To Add Length Or Repair Broken Locs. The Extensions Come With a Quality Dreadlocks...
  • Versatile Usage: These Dreadlock Extensions Are Perfect For Those Who Want To Sport The Reggae And Hip Hop Culture Hairstyle. They Can Be Used For...
  • Convenient Packaging: The Extensions Come In Various Pack Sizes, Including 30, 60, And 100 Locs Per Pack, With a Quality Dreadlocks Crochet Hook...
Bestseller No. 15
6 inch 30 Strands Loc Extensions Human Hair for Women/Men Can Be Dyed Bleached Curled 100% Full...
  • Hair Material:100% real human hair dreadlock extensions,You can test by burning. It is characterized by softness, Light weight and Natural, Can be...
  • Hair Features : 100% Handmade ,100% Human Hair Permanent Loc Extensions,0.6cm thickness, Natural, Adequate Quality,And they can also be washed...
  • Easy to install: The locs can be added to existing locs to add length or for repairs on broken locs.
  • Scenes to be used:the Hairstyle of REGGAE and Hip-Hop Culture, Daily use, travel, party, performance etc. Suitable for any occasion and season.
  • Packing: 10locs/20locs/30locs/40/locs/50locs/60locs/70locs/90locs/100locs/ pack with Quality Dreadlocks Crochet Hook (Usually make a full head needs...
Bestseller No. 16
DAIXI 0.4cm Thickness 70 Strands 8 Inch 100% Real Human Hair Curly Wave Dreadlock Extensions for...
  • ♥Hair Material: 0.4cm 0.6cm and 0.8 cm Thickness Dreadlocks, Made of 100% Human Hair, Soft, Light Weight and Natural, Can Be BLEACHED, Dyed, Curled...
  • ♥Advantage: Passed Burning and Dyeing Test Successfully. 100% Hand-made and 100% Human Hair Permanent Loc Extensions, Natural, Adequate Quality,...
  • ♥Packing: 10-100 locs/pack with Quality Dreadlocks Crochet Hook/Needle and Rat Tail Comb, Can be Trimmed to the Length you Want,Usually 30-60...
  • ♥Feature: These Dreadlock Extensions are EASY to use .You will Become Like a Superstar by Using it. It's also the Hairstyle of REGGAE and Hip-Hop...
  • ♥Easy to install: The Locs Can be Added to Existing Locs to Add Length or for Repairs on Broken Locs. And they Can Also Be Washed Normally and They...
SaleBestseller No. 17
Alishow 6-18 inch Loc Extensions Human Hair Dreadlock Extensions for Men/Women 100% Real Human Hair...
  • Hair Material: 6-18 Inch Handmade Human Hair Dreadlock Extensions, made of 100% Human Hair, Soft, Light Weight and Natural, Can be Bleached, Dyed,...
  • Hair Features : 100% Handmade ,100% Human Hair Permanent Loc Extensions,0.6cm thickness, Natural, Adequate Quality,And they can also be washed...
  • Packing: 10-30 locs/pack with Quality Dreadlocks Crochet Hook/Needle and Rat Tail Comb, Can be Trimmed to the Length you Want.It could be more or less...
  • Easy to install: The Locs Can be Added to Existing Locs to Add Length or for Repairs on Broken Locs. And they Can Also Be Washed Normally and They are...
  • Full Hand-made Permanent Loc Extensions, Adequate Quality, No Shedding, No Smell, No tangle. Require only regular cleaning and maintenance,We just...
Bestseller No. 18
Haredluck Omber Red Dreadlock Extensions 0.8cm Width 10 Inch 20 Strands 100% Human Hair Full...
  • 1. Hair Material: 0.8 cm Thickness Dreadlocks, 100% human hair dreadlocks can be dyed ,bleached ,curled and Twist . For Fashion Women/Men/Kids.
  • 2.Hair Feature:High Quality Human Hair dreadlock extensions very EASY to use, It's also the Hairstyle of REGGAE and Hip-Hop Culture .Full Hand-made...
  • 3.Hair Details:8-14inch, 0.8-0.2cm Width,10/20/30 strands for one pack , Free Crochet Needle.
  • 4. Hair Care: Regular cleaning and trimming, do not make your hair too tight, keep for a long time and care for the scalp. The locs extensions may be...
  • 5.It may be some floating hair or broken hair on the locs extensions, it's normal , it will be fine after you take a good shake or washing it in the...
Bestseller No. 19
6 Inch 0.4cm Thickness Dreadlock Extensions Human Hair 60 Strands Locs Extensions Real Human Hair,...
  • Hair Material:100% real human hair dreadlock extensions,You can test by burning. It is characterized by softness, Light weight and Natural, Can be...
  • Hair Features : 100% Handmade ,100% Human Hair Permanent Loc Extensions,0.4cm thickness, Natural, Adequate Quality,And they can also be washed...
  • Easy to install: The locs can be added to existing locs to add length or for repairs on broken locs.These locs extensions require only regular...
  • Scenes to be used:the Hairstyle of REGGAE and Hip-Hop Culture, Daily use, travel, party, performance etc. Suitable for any occasion and season.
  • Packing: 10locs/20locs/30locs/60locs//100locs/pack with Quality Dreadlocks Crochet Hook(Usually make a full head needs 30-60 strands)
Bestseller No. 20
JISHENG Loc Extensions Human Hair 0.4 cm 8 Inch 30 Strands Dreadlock Extensions Human Hair for Men...
  • 🧡【Hair Material】Loc Extensions Human Hair, Made With Afro Kinky Bulk Hair, Real Human Hair Dreadlock Extensions. No Synthetic fiber or Animal...
  • 🧡【Hair Advantage】Handmade Permanent Loc Extensions, Adequate Quality, Superior Texture. Natural Looking, Longtime Lasting, Full and Thick, No...
  • 🧡【Easy to Install】Lock Extensions for Black Women, Men, Teens. Suitable for Any Seasons and Occasions: Daily use, Travel, Party, Graduation,...
  • 🧡【Package/Gifts】JISHENG Dread Extensions Human Hair, Width: 0.2/0.4/0.6/0.8cm. Size:4-18 Inch. Locs:10/30/60/70/100. Color: 1B Natural Color,...
  • 🧡【JISHENG Locs】Loc Extensions Human Hair 0.4 cm 8 Inch 30 Strands Dreadlock Extensions Human Hair for Women Men Dread Extensions Human Hair...
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FAQ:

Q: How to make dreadlock extensions?

A: Before the installation,wash your hair as best as possible twice in a row. Use a residue free shampoo. Detangle your hair. Your natural hair has to be completely dry before the appointment.

Q: How to extend your dreadlocks?

A: Use residue-free shampoo to wash your hair. First and foremost,wash your hair carefully with a residue-free shampoo. … Divide your hair into small sections. Take a wide-tooth comb to section your hair into small squares. … Twist to form locks. After you have done with sectioning,take each section down to start twisting back and forth. …

Q: How to style short dreadlocks for men ?

A: – The brushing method works best for coarse hair that’s 3/4″ to 2.5″ (1.905 cm – 6.35 cm) long. – You can also use a sponge brush, which is made specifically to create dreads and curls in someone’s hair. – Using a sponge brush often works better on short hair than using a bristle brush.

Q: How to install de dread extensions?

A: – 3.1 Wash the hair two times or so a week – 3.2 Dry the hair completely – 3.3 Protect the extensions during sleep