Arena Swimming Mens Powerskin ST 2.0 Jammer Racing Trunks FINA approved Get ready for Powerskin ST 2.0. These racing jammers for men have better resilience, better compression and better stretch. We revamped our tech swimsuit for racers and swimmers of all levels with three high-tech knit fabrics and a durable lining for optimal muscle support and freedom of movement. All seams are flatlock for a snug fit against the body, and the new ergonomic seam placement improves body and leg position in the water. Enhanced support and comfort plus a sleek finish make our newest Powerskin ST a high performance swimsuit with exceptional hydrodynamics. This FINA-approved design is a comprehensive racing and training solution Composition: 71% Polyamide 29% Elastane MPN: 2A900