This IPX8 tested Waterproof Bum Bag is perfect for keeping your smart phone, car keys and valuables safe and dry. It has a triple seal for maximum protection with a Velcro flap to keep the seal securely closed. Sitting snug on the waist, it is lightweight and has no drag making this the perfect waterproof bum bag for swimming. It can also be used while stand up paddle boarding, running, surfing, sailing or on holiday! The adjustable belt design clips securely around the swimmer’s waist.