Double-sided hair extension tape is a thin adhesive strip with adhesive on both faces, each covered by a peel-off liner until use. In a tape-in install, one face bonds to the extension weft and the other grips a thin section of natural hair, and a second weft closes the sandwich. Pre-cut tabs are most often 4 cm × 0.8 cm.
Almost every pre-taped weft and almost every replacement tab is double-sided. It is the default, so it is rarely explained.
This entry covers what the tape is made of, the formats it comes in and what each face does in an install. Choosing between single- and double-sided is covered in its own guide.
What is double-sided tape made of?
Double-sided extension tape is a layered strip: a thin film carrier in the middle, a pressure-sensitive adhesive coated on each side, and a release liner protecting each adhesive face. Walker Tape describes its extension tapes as a modified acrylic adhesive on a film carrier. Brands do not all publish their chemistry.
The carrier keeps the strip flat and stops it stretching. The adhesive bonds under pressure, with no heat, and builds strength over the first day, which is why the advice is to wait about 24 hours before washing. The full adhesive families are in the hair extension adhesive entry. Vanity has not published its tab adhesive chemistry.
What are the liners for?
Liners are the peel-off backing papers or films on each adhesive face. They keep the adhesive clean until use and let you expose one face at a time: one liner comes off to stick the tab to the weft, the second comes off only at install, when the weft goes onto the hair.
Liners are often coloured or printed so the face is easy to see, while the tape itself is usually clear. A common install fault is touching the exposed adhesive: skin oil weakens the grip, so handle tabs by the liner edge.
What formats and sizes does it come in?
It comes as pre-cut tabs, as strips and as rolls. Pre-cut tabs for standard tape-in wefts are most often 4 cm × 0.8 cm. Rolls are sold by width and length and cut to size, which suits stylists who work with varied weft bases. Minis and curved shapes exist for hairlines and thin areas.
| Format | What it is | Who tends to use it |
|---|---|---|
| Pre-cut tabs | Sheets of tabs at a fixed size, commonly 4 cm × 0.8 cm | At-home move-ups and most salon re-tabs |
| Mini or curved tabs | Smaller or shaped tabs for narrow wefts | Hairline and fine-hair placement |
| Rolls | Continuous tape by width and length, cut by hand | Stylists working with mixed weft sizes |
How does a sandwich use double-sided tape?
A sandwich uses two wefts, each with a double-sided tab. The first weft goes under a thin, flat section of natural hair, adhesive up. The second weft goes on top, adhesive down. The hair sits between two adhesive faces, and firm pressure bonds them through it.
That is why one sandwich takes two tabs, and why a 60-tab pack is 30 sandwiches. When a weft is re-tabbed at a move-up, the old tape is stripped off and one fresh double-sided tab goes on the clean base. For the step-by-step install and the single-sided alternative, see single-sided vs double-sided tape.
What do people get wrong about it?
People often assume double-sided means stronger. It means adhesive on both faces, not a stronger adhesive. Others assume all double-sided tabs are interchangeable. Size, adhesive strength and the remover it pairs with differ by brand, and those differences show at removal.
- Double-sided is not the same as "double hold". The grip comes from the adhesive, not the number of faces.
- Generic double-sided craft or wig tape is not built for a hair-to-hair sandwich.
- A double-sided tab can be used single-sided in some methods, but that is a different install.
What this entry is based on
Based on Vanity's published tab specifications, daily salon use at Vanity Hair Salon, and Walker Tape's published description of extension tape construction.
Questions we get asked
Is double-sided tape the same as tape-in tabs?
Mostly. "Tabs" usually means pre-cut double-sided tape sized for wefts. Single-sided tabs also exist, so check the listing.
What size is double-sided extension tape?
Pre-cut tabs for standard wefts are commonly 4 cm × 0.8 cm. Vanity's tabs are that size.
Which side goes on the weft?
Either face can, since both carry adhesive. Peel one liner, press that face to the weft, and leave the second liner on until install.
Can I use double-sided wig tape on extensions?
It is not designed for it. Wig tape is built to hold to skin, not to bond hair between two wefts.
Related terms
- Hair extension adhesive
- Hold time
- Replacement tape tabs
- Sandwich
- Shelf life and storage
- Single-sided tape
- Tab
- Tape liner
Sources
Every price, specification and claim about another brand on this page traces to one of the references below. Each was read on the date shown. Where a figure could not be verified from a primary source we've left it out rather than estimated it.
- Walker Tape, What Is Hair Extension Tape Made Of? Extension tape construction: modified acrylic adhesive on a film carrier with release liners. Accessed 2026-10-27
- Walker Tape, How To: Remove Tape from Extensions Stripping old tape before re-taping a weft. Accessed 2026-10-27
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.