Swimwear labels are one of the trickiest jobs in the whole label category. A swimsuit sits directly on skin, stretches in every direction, soaks in chlorinated or salt water, dries in the sun and gets washed more often than almost any other garment. A label that would last years in a T-shirt can fray, fade, stiffen or leave a red mark on skin in a swimsuit. In this article we look at the requirements, compare printed satin, TPU labels and heat transfers, and share practical placement tips.
What destroys a swimwear label
- Chlorine – oxidises dyes and prints and damages fibres, especially elastane.
- Salt water – salt crystals abrade the surface and speed up edge fraying.
- UV light – fades colours and makes some materials brittle.
- Sunscreen and oils – leave stains and can soften adhesives.
- Constant stretching – a stiff label on stretch fabric pulls at the seam and can be felt.
- Staying wet – a label that absorbs water stays cold and damp against skin.
Satin label 14 cm x 5 cm - satin print
Woven label 8.5 cm x 7 cm – Gold effect, jacquard
Satin label 6 cm x 3 cm – printing on satin ribbonWhat the label needs to do
- Resist chlorine, salt and UV.
- Dry quickly – the material shouldn't hold water.
- Feel soft, with smooth edges that don't scratch.
- Stay small – there isn't room for a big label on swimwear.
- Keep composition and care text legible for the life of the product (a requirement of EU Regulation 1007/2011).
Comparing the three main options
| Criterion | Printed satin label | TPU label | Heat transfer (tagless) |
|---|---|---|---|
| Chlorine and salt | Good with polyester satin and durable print | Very good – doesn't absorb water | Good with quality ink |
| Softness | Soft, but has edges | Soft and flexible | No label at all – most comfortable |
| Drying | Moderate | Fast | Fast (part of the fabric) |
| Stretch | Doesn't stretch | Slightly elastic | Stretches with the fabric if the ink is right |
| Branding | Logo and text, printed | Raised logo, matte or gloss | Logo, size, composition straight on the fabric |
| Best for | Care label in a side seam | External logo on bikinis, board shorts, sport swimwear | Inside information with no label |
Printed satin label
The classic choice for the composition and care label. Polyester satin is smooth, thin and chlorine-resistant, and thermal-transfer printing on it survives many washes. The weak spot is the edges – choose labels with a soft, sealed cut and place them inside a seam rather than exposed. Satin labels also work well in board shorts, where there's a lining or waistband.
TPU label
TPU (thermoplastic polyurethane) is a soft, flexible material that doesn't absorb water and resists chlorine, salt water and UV. It's used for raised logos that are heat-applied or stitched around the edge. It suits an external logo – on the hip of a bikini or the leg of board shorts, for example. It's less common as an inside composition label.
Heat transfer (tagless)
The information is printed straight onto the inside of the fabric – no sewn label at all. For swimwear this is very comfortable, since there's nothing to irritate. It needs good-quality stretch inks and correct press settings; done badly, the print cracks when stretched. It suits larger runs and makers with a heat press.
Tip: many brands combine methods – a heat transfer or TPU badge for the logo and a small satin care label in the side seam. That way they meet the rules without sacrificing comfort.
Where to place the label
- One-piece and bikini bottoms – in the left side seam of the lining, at hip level, not in the centre-back seam where you sit on it.
- Bikini tops – in the side seam under the arm or at the clasp if there is one; avoid the underwire area.
- Board shorts – on the inner waistband or in a pocket seam.
- Sew the label on one side only (as a flag) so it doesn't restrict the seam's stretch.
- Use polyester thread – it stands up to chlorine better than cotton.
Troubleshooting
| Problem | Likely cause | Fix |
|---|---|---|
| Label scratches the skin | Hard edge, unsealed cut, exposed label | Soft ultrasonic-cut satin, caught in a seam, flag placement |
| Print fades after one season | Chlorine and UV, ink not suited to swimwear | Durable thermal-transfer print on polyester satin, dry in the shade |
| Stitching around the label breaks | Straight stitch on stretch fabric | Attach in a seam only, zigzag or overlock, polyester thread |
| Heat-applied logo peels | Wrong press settings, sunscreen oils | Test settings, stitch the TPU badge around the edge as well |
| Label stays wet for ages | Absorbent material, oversized label | A smaller synthetic label or a tagless solution |
Don't forget the elastic
The label is only part of the story. The elastic in swimsuit edges and straps faces the same conditions and is often the first thing to fail. Our article in the elastics section explains which elastic survives chlorine, and you'll find stock options in our elastics category.
Care instructions for the label
Swimwear care labels usually recommend: rinse in cool clean water after use, hand wash or a delicate cycle up to 30 °C, no bleach, no tumble drying, dry in the shade. These instructions protect both the fabric and the label.
FAQ
Does a swimsuit legally need a composition label?
Yes – swimwear is a textile product covered by EU Regulation 1007/2011, so the fibre composition must be shown durably and legibly.
Can I use a woven jacquard label on swimwear?
You can, if it's small and soft, but woven labels are usually thicker and dry more slowly than satin. Satin, TPU or heat transfers are the more common choices.
Do you offer TPU labels?
Our catalogue covers woven, satin and canvas labels. For TPU logos or other specialist solutions, describe your project in an enquiry and we'll look into the options.
