... elastic .Waterproof 3.With headphone jack 4.Armlet, cell phone holder sports arm band soft belt for iphone 4/4s Product ... conditionCan be used as armlet for protection and cell phone holder for iPhone 4/4s With headphone jack, convenient for listening ... choose who love outdoor sports, such as fishing, travelling,ridingIncorporated earphone access socket and key pocket Protects from bumps and scratches ...