Nabaiji B-Active Yoke Boys Boxer Swim Shorts - Wozki Red Designed for the occasional young swimmer who trains less than once a week in a pool or outdoors. More than 100 hours of use: recommended for occasional use. It lays flat against the skin and allows legs to move without difficulty. Main fabric: 80.0% Polyamide, 20.0% Elastane. If you swim occasionally this material will be fine for you, otherwise opt for a 100% polyester material. 2 Years warranty.