Some might call Billabong's PX1 21" Quad Stretch Boardshorts the ultimate garment created for aquatic activities. Why, you ask? The fit, feel, and freedom-of-movement are ridiculous thanks to an 87/13 blend of nylon and spandex, which also stretches to a crazy amount! Billabong PX1 Boardshorts also sport PX Infinite Seam technology for a chaffe/scratch-free experience, and H2 Repel keeps them from weighing you down.