The Waterproof iPhone Case from LifeProof ($80) is a sleek iPhone case that’s 100% waterproof, dirtproof, snowproof, and shockproof. Compatible with the iPhones 4 and 4S, the LifeProof case is a necessary investment if you activities include anything your cell phone insurance won’t cover. Training for a triathlon? The LifeProof case keeps your cell phone dry and accessible. The ultra-slim case only adds 1.5mm to the depth of your iPhone and weighs less than an ounce (28g) while keeping all phone features operational.