What Are Weft Hair Extensions? Seam and Format Comparison

PLUCHARM / PROFESSIONAL BUYING GUIDE

What a weft actually is

A weft is a curtain of hair joined together along one edge so that it can be
attached as a row rather than strand by strand. The joined edge is the
seam, and almost everything that distinguishes one weft from another is a
consequence of how that seam is built — how thick it is, whether it carries short
return hairs, whether it can be cut, and how much hair the row carries.

For a stylist, the seam decides the installation. For a buyer, it decides the
cost per client. Those two views do not always point at the same format, which is
why most professional ranges carry more than one.

The four weft formats you will be offered

Machine weft

The seam is stitched by machine, densely and strongly. It carries the most hair
per row of any format, which makes it the most economical way to build volume — the
lowest cost per gram.

Two consequences follow. The seam is thicker than the others, so it is more
visible on fine hair and harder to conceal. And because the stitching is set along
the length, a machine weft cannot be cut. It is ordered per row,
so a shorter installation carries surplus material you paid for and cannot use.

Suits: volume-led installations on medium to thick natural hair; accounts
buying on cost per gram. See machine weft.

Hand-tied weft

Built row by row by hand. The seam is thinner and softer than a machine weft,
and the hair drapes with the natural hair rather than sitting on top of it. It
carries return hairs — the short folded hairs that give the weft its body — which
sit against the scalp.

The seam is flexible enough to be sized to the head, but it cannot be
cut along its length: cutting releases the knots and the row sheds from the
cut point. It is ordered to size rather than trimmed on the day.

Suits: natural finish on finer hair; clients who need a concealed seam. See
hand-tied weft.

Genius weft

The newest format, and the one that changed how wefts are used. It has the low
profile and natural drape of a hand-tied weft, but the seam is constructed so that
it can be cut anywhere along its length without the hair releasing.
It also carries no return hair, so there is no ridge and nothing short and rough
against the scalp.

The commercial consequence is the important one: a row can be trimmed to the
exact circumference of one head, so a pack can be split across clients instead of
being consumed by one installation. Yield per pack rises even when the unit price
does not change. See genius weft.

Flat silk and tape wefts

These depart from the sewn seam altogether. A tape weft carries a
polyurethane or adhesive base, so it is installed by sandwiching or sealing rather
than sewing. They install faster than any sewn format and are covered on the
wholesale overview alongside the strand methods.

The four formats side by side

How to choose, in the order that matters

1. Start with the client’s natural hair, not the price. A thick
   machine weft on fine natural hair will ridge and pull. A genius weft on very thick
   hair may need more rows than you expected to reach the volume wanted.
2. Ask whether you need to cut. If installations vary in length
   and you want to size a row rather than order to size, only a cut-anywhere seam will
   do it. This single question eliminates most of the field.
3. Then compare landed cost per install, not price per pack. A
   cheaper pack that wastes a third of its weight on a shorter installation is not
   cheaper. Multiply the price by how many installations the pack actually yields.
4. Check the cuticle, not the grade label. Grade numbers are not
   standardised across the trade. Run your fingers down the bundle from root to tip and
   back: aligned cuticle feels smooth one way and catches the other. Identical both
   ways usually means stripped hair, which mats within weeks.
5. Check consistency across batches, not just the sample. A sample
   proves grade and colour. It does not prove the tenth order will match the first. Ask
   whether the supplier works to a written specification and matches colour to a
   physical ring.

Colour, across formats

Most accounts carry more than one method, because different clients need
different things from the same salon chair. The failure that shows up in the chair
is a colour mismatch between them — a weft row reading cooler or warmer than the
tape beside it, most visibly on light and colour-worked hair.

That is why matching to a single physical shade ring matters more than any
individual format’s specification. At PLUCHARM all thirteen methods are matched to
one ring, and if you already sell extensions we match to your ring rather
than ours so your shade numbering stays intact.

Installation is not the same question as format

Beginners often treat “which weft” and “which installation” as one decision.
They are two. A sewn weft works on a braided foundation, a beaded row, or as part
of a hybrid installation alongside tape or bonded strands. The weft is the product;
the attachment is the stylist’s choice and depends on the client’s natural hair,
their routine and how long they expect to wear it.

What the format does constrain is what happens at the seam: whether you can trim
it, whether it ridges, and whether the hair comes back for a refit. Those three
things determine cost per client more than the installation method does.

Buying wefts at wholesale: what to verify first

• Cut the seam. On any cut-anywhere format, trim a row and comb
  it firmly. If it releases, it is not what was described.
• Feel for return hair. Run your fingers along the seam and feel
  for short, rough hairs standing up. On a genius weft there should be none.
• Weigh a pack. Net weight against the declared figure — the
  specification buyers are short-changed on most often, and the easiest to check.
• Wash and heat-test a section before the goods go into stock.
• Ask what happens when a batch fails. Any supplier can promise
  quality. What matters is whether they remake, credit, or return — and who pays the
  freight.

Where to go next

The full range of thirteen methods, with the trade terms that apply to each, is
on the wholesale hair extensions page. If you want to test a
format before committing to a run, a sample will tell you more than any
specification sheet — starting with the genius weft, whose whole
value is in a property you can verify in a minute with a pair of scissors. Or see
private label hair extensions if you want any of these built
under your own brand.