Unless for some reason you enjoy getting rashes where the sun don't shine, you'd better wear the Hurley Men's Pro Max 23in Compression Surf Shorts under your board shorts when you head out for all-day surf sessions. Its smooth, stretchy fabric protects your skin from sun, sand, and irritation without inhibiting movement, and with targeted compression in key areas, these shorts also stabilize and support muscles so you can stay out in the lineup longer.