Baleaf Men's PBT Durable Solid Athletic Jammers Swimsuit 52% Polyester/48% PBT Chlorine resistant fabric designed to lasts longer than other conventional swimwear fabrics Lightweight, quick-dry and durable fabric resists sagging, fading and snagging A compressive fit for reduction in drag provides better performance for your racing or training. Inner drawschord at waist for secure fit. Please choose ONE SIZE UP than you normally wear