The shorts have a built-in waterproof pocket made from Neodymium magnets, which are the world’s strongest magnets. This ensures you can swim with your valuables without them getting wet. It has an IPX-8 certification which means it is completely waterproof (and dustproof, air proof!) upto depths of 100ft and was used by a development program by NASA in 2018 where they required the highest performance liquid-tight closure system!