The Truth About Seamless Underwear. Why does it Cost More to Produce? - Underwear

This guide explains the truth about seamless underwear. why does it cost more to produce? - underwear from a practical B2B sourcing perspective, helping brands reduce sampling risk, control quality, and make faster purchasing decisions.

1. What is seamless underwear?

Seamless underwear" is basically a one-off underwear produced by weft knitting using novel special equipment. It uses the same high technology used to produce high-stretch knitted outerwear, underwear and high-stretch sportswear.

So that no seams are needed at the neck, waist and hips, and only a patch process is required at the crotch area as a post-process. It is an upgrade of wearing comfort and skin touch on the basis of seamlessness.

In layman's terms, seamless underwear is the same as the usual socks, the whole circle woven, the sides are not cut, so there is no seam line, and in the chest and hips there are additional woven parts, is a three-dimensional clothing type.

The types of seamless panties are flat pants, trunks, thongs, etc.

Key Insights for Buyers

• 2. What is the material of seamless panties?
• The main materials of seamless panties are nylon and polyester. The content of spandex is usually about 15%. Seamless panties made of these two materials have the advantages of good elasticity, high fit with body curves, close to the skin and no deformation. In addition, some manufacturers also add a small amount of cotton yarn to make seamless panties more breathable.
• The main disadvantage is that the fabric is easy to wrinkle and not easy to clean.
• Nowadays, there are many new high-tech materials being developed for seamless underwear, such as bamboo fiber, milk protein fiber and seaweed fiber.
• 3. Features of seamless underwear

Action Checklist

1. Confirm fabric, size grading, and trim specifications before sampling.
2. Lock in MOQ, lead time, and quality checkpoints in writing.
3. Request pre-production confirmation for labels, packaging, and compliance standards.
4. Use a pilot run to validate fit, durability, and customer feedback before scale-up.

If you are planning OEM/ODM underwear sourcing, prepare your tech pack and target quantity first to speed up quotation and sample approval.