Foil stamping presses metallic or coloured foil into the fabric with a heated die. On the right fabric it reads as genuinely premium; on the wrong one it looks patchy and cheap.
Fabrics that take foil well
Velvet, microfiber, suede and satin are the reliable surfaces — dense, smooth-faced fabrics where the foil has something even to bond to. These are also the fabrics most jewelry and gift packaging uses, which is why foil and jewelry pouches go together.
Textured and open weaves are harder. On linen, jute or heavy canvas the foil sits on the high points of the weave and skips the low ones, giving a broken result that can look intentional at large scale and looks like a defect at small scale.
Artwork that survives
Foil rewards solid shapes and punishes fine detail. The things that fail: hairline strokes, small serif type, tight gaps between elements, and large solid areas on pile fabric where the foil can look uneven.
Practical guidance — supply vector artwork, keep line weights generous, avoid type below the size you have seen work on this fabric before, and where a design has both fine and bold elements, expect the fine parts to be the compromise.
Colour
Gold, silver and rose are the standard foils; coloured foils are available. Foil colour is not a Pantone match — it is a metallic film, and it reads differently depending on the fabric colour beneath it and the angle of light. Approve foil on the actual production fabric, not on a generic swatch.
Blind deboss as an alternative
The same die without foil gives a blind deboss — the mark is made by the impression alone. On microfiber suede this looks restrained and expensive, and it avoids the fine-detail problems foil has, because the mark is topographic rather than a film that must bond. Worth considering when the brand direction is understated.
What to check on the stamped sample
Look at four things: coverage (any skipped areas in solid regions), edge definition on the finest element in the design, position and squareness relative to the seams, and durability — rub the mark firmly and see whether it lifts. Then look at it under the lighting the product will actually sell in, because metallic finishes are entirely light-dependent.