Speedo Men's Sonic Boom FLX System Board Shorts 90% Polyester/10% Spandex Exclusive flx system stretch inset waistband that expands as you move for optimum fit and superior comfort Quick drying and lightweight 4-way stretch fabric for unbelievable fit and performance with full mesh liner Longer length 22 outseam for fit at or just below the knee with side pocket with bonded zipper Silicone printed drawcord spanning the entire waist for more secure fit Made by speedo, the world's #1 swim brand