Double-sided tape has adhesive on both faces and is the standard for tape-in installs: two wefts sandwich a thin slice of your hair. Single-sided tape (also sold as one-sided or single face tape) has adhesive on one face only. Stylists use it to pair one weft with a tab instead of a second weft, usually on fine or thin hair, and for repairs.
Most people searching for single-sided tape are holding the wrong roll. They bought tape for a tape-in install, and what they need for a standard sandwich is double-sided. The two look almost identical in the packet. They do different jobs.
This page explains both formats, the two install methods built on them, and how to pick. It ranks nothing. If you want product rankings, they are linked at the end of each section.
Tabs, sandwiches, liners
Every term on this page, defined in a line, with a link to the guide that covers it.The tape-in glossary
What is the difference between single-sided and double-sided tape?
Double-sided extension tape has adhesive on both faces, each protected by a release liner. Single-sided tape has adhesive on one face and a non-sticky backing on the other. Double-sided bonds a weft to hair and then to a second weft. Single-sided bonds to one surface only, so it closes a joint rather than building one.
Construction decides everything else. A double-sided tab can grip something on both faces, so it is what goes on the base of a weft before a sandwich install: one face on the weft, the other face onto your hair and the opposite weft. A single-sided tab grips on one face and presents a smooth back to the world. That makes it useful for covering, closing or patching, and useless for joining two wefts face to face.
| Double-sided tape | Single-sided tape | |
|---|---|---|
| Adhesive faces | Two, both lined | One, with a plain backing |
| Other names | Replacement tabs, tape-in tape, re-tape tabs | One-sided tape, single face tape, half tab |
| Standard job | The sandwich: weft, hair, weft | One weft closed with a tab instead of a second weft |
| Hair it suits | Most densities | Mostly fine or thin hair, and repairs |
| Wefts per bond | Two | One |
| What Vanity sells | Yes, 60 tabs per pack, 4 cm × 0.8 cm | No. We do not make single-sided tape |
Names vary by seller. Check the listing for the words "both sides" or "one side" before you buy.
How does the double-sided sandwich method work?
In the sandwich method, a stylist takes a thin slice of hair, places one double-sided weft under it sticky side up, then presses a second weft on top. Your hair sits between two adhesive faces. One sandwich uses two wefts and two tabs, and it is how most tape-in extensions are installed.
The sandwich is the default because it is symmetrical. The slice of hair is gripped from both sides, the load is spread across two adhesive faces, and the two wefts hide each other's tape. A pack of 60 double-sided tabs is 30 sandwiches, which is the count most of our customers plan a move-up around.
- Start clean and dryFreshly washed hair, no conditioner, oil or product at the roots. Residue is the most common reason a bond lets go early.
- Take a thin sliceThin enough to see light through it, and narrower than the 4 cm tab.
- Place the lower weftSticky side up, under the slice, a small gap from the scalp so the hair can move.
- Close the sandwichLay the upper weft on top, tab to tab, and press across the full width with the application tool.
- Leave it dry for 24 hoursNo washing and no heavy sweat while the adhesive sets.
The full row-by-row layout is on the placement map. For how many sandwiches a head takes, see the count guide.
What is the single-sided method, and why use it on thin hair?
In the single-sided method, a stylist places one double-sided weft under a slice of hair, then closes it with a single-sided tab on top instead of a second weft. It halves the hair weight at that point and lowers the bulk of the bond, which is why stylists reach for it on fine or thin hair that cannot carry a full sandwich.
Fine hair has less to hold on to. A full sandwich puts two wefts on a slice that may not be strong enough for them, and on a sparse head the bond can show. Swapping the top weft for a single-sided tab means one weft per slice. The tab's plain back faces outward, so it does not catch hair or lint, and it lies flatter under your own hair.
The trade is volume. One weft per point adds half the hair a sandwich would, so you either accept a lighter result or place more points. Some stylists mix the two: sandwiches in the lower rows where the hair is stronger, single-sided points higher up and near the hairline. If your hair is thinning rather than fine, read the thin-hair guide before deciding anything.
| Sandwich (double-sided) | Single-sided method | |
|---|---|---|
| Wefts per bond | Two | One |
| Tape used | Two double-sided tabs | One double-sided, one single-sided |
| Weight on the slice | Higher | About half |
| Flatness | Thicker bond | Thinner bond |
| Volume per bond | More | Less |
| Usual use | Most installs | Fine hair, upper rows, hairline, small gaps |
What we have not tested
Jaci's ten years of salon use are with double-sided tabs and the sandwich. We publish no hold time for the single-sided method, and we do not make single-sided tape. If you use it, follow the maker's instructions for that tape.
When do stylists use single-sided tape besides thin hair?
Outside fine-hair installs, stylists use single-sided tape for repairs and finishing: closing a weft whose partner has been removed, patching a bond that lifted at one edge, and in some hairpiece and topper work where only one face should stick. It is a specialist roll in a kit, not the tape that does the main install.
- A sandwich lost one weft. A single-sided tab closes the survivor until the next move-up.
- An odd gap near the hairline, where a second weft would show.
- Hairpieces and toppers, where one face bonds to a base and the other must stay smooth.
- Taking a sandwich out of a client who wants less weight, without redoing the row.
If you are comparing specific single-sided rolls, the ranking is on our single-sided tape page. We earn nothing from it because we do not sell the format.
Which one do you need?
If you are re-taping wefts for a normal tape-in install or a move-up, you need double-sided tape. Choose single-sided only if your stylist uses the single-sided method on fine hair, or you are doing a repair. Most home wearers who bought single-sided tape for a re-tape bought the wrong format.
| Your situation | Tape to buy |
|---|---|
| Re-taping wefts at a move-up | Double-sided |
| First install, average or thick hair | Double-sided |
| Fine hair, stylist uses one weft per slice | Double-sided for the weft, single-sided to close |
| One weft fell out of a sandwich | Single-sided, or re-tape the pair at the move-up |
| Topper or hairpiece base | Follow the piece maker's instructions |
Vanity tabs are double-sided and cut to the standard 4 cm × 0.8 cm weft base, so they re-tape any brand's double-sided wefts. For rankings across brands, see the double-sided tape list and the wider tape list. For a one-sided roll, see the one-sided tape collection.
How can you tell which tape you bought?
Peel one tab. Double-sided tape has a release liner on both faces, and after you peel both, both faces are sticky. Single-sided tape has one liner over the adhesive and a plain back that stays smooth to the touch. If the back of the tab does not stick to your fingertip, it is single-sided.
Packaging is less reliable than the tab itself. Some sellers call double-sided tabs "single tabs" because each piece is one tab, and some call single-sided tape "single face". The finger test settles it in a few seconds. Liners are often two colours on double-sided tape, which is another quick tell, though not every maker does this.
Does the tape type change how removal works?
The release is the same in principle for both: a solvent breaks the adhesive, then the weft lifts. A sandwich has two adhesive faces to release and a single-sided point has one plus the backing. Vanity's remover is built for Vanity's double-sided tape and will underperform on other brands' adhesive, including single-sided tapes.
With a Vanity sandwich, mist both sides of the bond, wait about 30 seconds, then guide the end of a rattail comb between the tabs. The weft lifts with little to no scraping. Because the remover is oil-free, the hair is clean afterwards and you can re-tab in the same sitting instead of washing first.
For removal on another brand's tape, single-sided or double-sided, use the remover that brand recommends. We would rather say that than sell you a bottle that works slowly on adhesive it was not built for.
What this guide is based on
Written by Jaci Finch, licensed cosmetologist in Utah with 21 years behind the chair. The sandwich guidance comes from ten years of daily use of Vanity double-sided tabs at Vanity Hair Salon in Orem. That is practitioner experience, not a controlled test.
The single-sided method is described as common stylist practice. We do not make single-sided tape and publish no hold time or removal timing for it.
Questions we get asked
What is single-sided tape for hair extensions?
Tape with adhesive on one face and a plain backing on the other. Stylists use it to close a single weft instead of adding a second one, mostly on fine or thin hair and for repairs.
Is one-sided tape the same as single-sided tape?
Yes. One-sided, single-sided and single face tape are the same format: adhesive on one face only.
Can I use single-sided tape to re-tape my extensions?
Not for a standard sandwich. Re-taping wefts that are installed in pairs needs double-sided tape, because each tab has to bond to the weft and to your hair and the opposite weft.
Is single-sided tape better for thin hair?
It can be. The single-sided method puts one weft on each slice instead of two, so there is less weight and a flatter bond. You get less volume per point, and a stylist should judge whether your hair can carry it.
What is the best double-sided tape for hair extensions?
We keep a separate ranking on the double-sided extension tape page, with where each one loses. This page explains the formats and does not rank them.
Does Vanity sell single-sided tape?
No. Vanity sells double-sided tabs, 60 per pack (30 sandwiches), plus a remover and an application tool.
Do Vanity tabs fit other brands' wefts?
They are cut to the standard 4 cm × 0.8 cm base, so you can strip another brand's tape and re-tab their double-sided wefts with ours. Jaci has done this with Bellami, Hairtalk and Babe wefts.
Does single-sided tape last as long as a sandwich?
We have not tested it and won't give a figure. Hold depends on the tape, the hair and the aftercare. Ask the maker of the single-sided tape you use.
Can I mix single-sided and sandwich bonds in one install?
Many stylists do, with sandwiches in the lower rows and single-sided points higher up or near the hairline. Keep the hair lengths matched so the two blend.
About the brands mentioned. We aren't affiliated with, endorsed by, or sponsored by any other company named on this page, and we earn no commission on anything we link to. Product names and trademarks belong to their respective owners. Prices, specifications and formulations are those published by each manufacturer at the time of writing and change without notice, check the current listing before you buy. Where we rank a competitor above our own product we mean it, and where we rank ours first we say which criterion produced that result so you can reject it. Reviews and comparisons here reflect our own experience behind the chair plus published information; they aren't laboratory tests unless a page says so explicitly. Nothing here is medical advice. If you believe we have described your product unfairly or inaccurately, email info@vanityhairsolutions.com and we will correct it. Last reviewed 2026-10-27.