The black Dri Cat Neck it Waterproof Case with Lanyard for iPhone 4/4S from EK USA is a silicone and polycarbonate shell submersible to 18'. The case clamps shut and is sealed with an interior o-ring gasket. Make or receive calls while you're in the water or just listen to music. The removable lanyard has a quick-release. It should be noted that you cannot use waterproof headphones while in the water since all the ports on the case are sealed.
In the Box
EK USA Dri Cat Neck it Waterproof Case with Lanyard for iPhone 4/4S (Black)
Limited 90-Day Warranty Against Manufacturer's Defects