What a sew-in is and how it stays in place

A sew-in (also called a weave) is a hair extension method where wefted hair—hair sewn onto a long strip of thread—is stitched directly onto your natural hair using a needle and thread. The process starts with your stylist braiding your natural hair into thin, flat cornrows that run across your scalp. The wefted hair is then sewn onto these braids using a curved needle and thread that matches your hair color, creating a find base that can last four to eight weeks with proper care.

Unlike clip-in extensions or tape-ins, sew-ins don't come out at night. They stay in place through washing, sleeping, and daily activity because they're anchored to your braids. The weight and tension of the extensions are distributed across multiple braids rather than concentrated in one spot, which is why this method works well for people who want a long-lasting style without daily reinstallation.

Key Takeaways

  • Your natural hair is braided into cornrows, and wefted hair is hand-stitched onto those braids using a curved needle and matching thread.
  • The entire installation takes two to four hours depending on the amount of hair, your hair texture, and the stylist's speed.
  • Sew-ins typically last four to eight weeks before they need to be removed and reinstalled, though some people go longer.
  • Proper care—sleeping on a silk pillowcase, moisturizing your braids, and washing gently—extends the life of both the extensions and your natural hair underneath.
  • Removal requires a stylist to carefully cut the thread and unravel the braids; attempting to remove them yourself can cause significant breakage.

Preparing your hair before installation

Start with clean, dry hair. Wash your hair two to three days before your appointment so your scalp has time to produce natural oils, which protect your braids and the roots of your natural hair. If you wash the day of installation, your hair will be too slippery for the braids to hold securely.

Detangle your hair thoroughly before you arrive. Use a wide-tooth comb or detangling brush to work through any knots, starting at the ends and working up toward the roots. If your hair is prone to tangling or you have a lot of texture, consider doing a deep conditioning treatment the night before—this makes detangling easier and strengthens your hair before the braiding process.

Trim any split ends if you haven't done so in the last six to eight weeks. Split ends can travel up the hair shaft during the braiding and sewing process, causing more breakage. You don't need a full haircut, just a cleanup of the ends.

The braiding step: creating the foundation

Your stylist will section your hair and braid it into cornrows that run from the front of your scalp toward the back. The number of braids depends on how much hair you're adding and the look you want—typically four to eight braids for a full head of extensions. The braids should be tight enough to hold the wefted hair securely but not so tight that they cause tension headaches or pull on your hairline.

The braids are the foundation of the entire install. If they're too loose, the extensions will slip and move around. If they're too tight, they can cause traction alopecia (hair loss from constant pulling) over time. A skilled stylist will find the middle ground. This step usually takes 45 minutes to an hour and a half, depending on your hair texture and the number of braids needed.

Sewing the wefted hair onto your braids

Once the braids are complete, your stylist will begin sewing the wefted hair onto them. They'll use a curved needle (which is easier to maneuver on the scalp than a straight needle) and thread that matches your hair color. Starting at the nape of your neck, they'll position the weft against the braid and sew it down using a whip stitch or similar technique, moving the needle in and out of the weft and around the braid.

Each row of weft is sewn down individually, and the rows are placed close together so there are no visible gaps between them. The stitching needs to be tight enough that the weft won't slip, but not so tight that it cuts into the braid or causes discomfort. This part of the process takes the longest—usually one to two hours for a full head—because it requires precision and care.

Once all the wefts are sewn down, your stylist will cut the hair to blend with your natural hair length and texture, and style it as you've requested. Some people get layers, some get a blunt cut, and some keep the length uniform.

How long installation takes and what to expect during the appointment

Plan for two to four hours total, depending on several factors. If you have a lot of natural hair, thick hair, or a large head, installation takes longer. If you're adding a lot of extensions or want a complex style, add time. A stylist who works quickly might finish in two hours; one who works more slowly or carefully might take four.

Bring something to do—a phone, a book, or headphones—because you'll be sitting still for a long time. Some salons have a waiting area with a TV or WiFi. Wear comfortable clothes and use the bathroom before you start, since getting up and down repeatedly can loosen the braids.

Your scalp may feel tender or tight when you first leave the salon, especially if the braids are snug. This usually fades within a few days as your scalp adjusts. If the tightness doesn't improve or causes pain, contact your stylist—the braids may need to be loosened.

Caring for your sew-in to make it last

Sleep on a silk or satin pillowcase, or wrap your hair in a silk scarf before bed. Cotton pillowcases create friction that causes frizz and can loosen the braids over time. Silk reduces friction and helps your extensions stay smooth and shiny.

Wash your hair gently in the direction of the braids, using lukewarm water and a sulfate-free shampoo. Avoid scrubbing your scalp hard or rubbing the extensions. Condition the extensions themselves but be careful not to condition the braids too heavily, as buildup can weaken the thread. Rinse thoroughly.

Moisturize your braids and scalp regularly. Use a lightweight oil or braid spray two to three times a week to keep your natural hair and the braids from drying out. Dry braids are more likely to break and can cause itching. Keep your hair out of tight ponytails or buns while the sew-in is in, as this puts extra tension on the braids.

Avoid excessive heat styling on the extensions themselves, though you can use a blow dryer on low heat. High heat can damage the hair and weaken the thread holding the wefts in place.

When and how to remove your sew-in

Sew-ins typically last four to eight weeks. After that, your natural hair grows out and the braids loosen, which causes the extensions to shift and slip. Some people go longer, but the longer you wait, the more your natural hair grows and the more stress is placed on the braids and roots.

Do not try to remove a sew-in yourself. Cutting the thread and unraveling the braids requires skill and patience. If you pull too hard or cut incorrectly, you can snap your natural hair or damage the roots. A stylist will carefully cut the thread, gently unravel each braid, and detangle your natural hair. Removal usually takes 30 minutes to an hour.

After removal, your hair will need a break. Give it at least one to two weeks before installing new extensions. During this time, deep condition your hair, trim any damaged ends, and let your scalp recover. This rest period is crucial for keeping your natural hair healthy long-term.

Frequently Asked Questions

Can I wash my hair the day after installation?

Yes, but wait at least 24 hours so the thread has time to fully set. When you do wash, use cool or lukewarm water and be very gentle. Avoid rubbing or pulling on the braids. Some stylists recommend waiting 48 hours for the first wash to be extra safe.

What if my braids start itching?

Light itching is normal for the first few days as your scalp adjusts. If it persists, it usually means your braids are too tight, your scalp is dry, or there's product buildup. Use a braid spray or lightweight oil to moisturize, and if the itching doesn't improve in a week, contact your stylist about loosening the braids.

Can I swim or go in a hot tub with a sew-in?

Yes, but rinse your hair with fresh water when ready afterward to remove chlorine or salt water, which can damage the extensions and weaken the thread. Wear a swim cap if possible to reduce exposure. Avoid very hot water, as extreme heat can weaken the thread over time.

How much does a sew-in cost?

Installation costs vary widely depending on your location, the stylist's experience, and how much hair you're adding. Prices typically range from $100 to $400 or more for installation alone. The cost of the hair itself is separate and depends on the quality and length. Ask your stylist for a full quote before your appointment.

Will a sew-in damage my natural hair?

Sew-ins can be safe for your natural hair if they're installed and cared for properly. The risk comes from braids that are too tight, poor maintenance, or leaving them in too long. Following the care steps in this guide and removing them every four to eight weeks will help protect your natural hair.