Baleaf Men's Quick Dry Solid Square Leg Swimsuit 80% nylon + 20% spandex Breathable, soft,lightweight and quick drying fabric 100% chlorine-resistant material withstands countless workouts Stretchy square-leg design with flat seams for more comfort Elastic waistband for a snug, adjustable fit Cold Water Hand Wash Only. Size chart was updated on Sep.9th, 2016, better go up 1-2 size than regular