The material changes color when exposed to UV light.

Sweat fabrics are knitted fabrics and consist of intertwined loops. Unlike other knitted fabrics, such as jersey, sweat fabric has an additional thread knitted into the reverse side, which is then roughened. This makes the reverse side nice and cozy and warm. The fabric drapes softly and is very comfortable to wear; it is firmer and has a better grip than jersey. Sweat is perfect for...