Nathan SonicMount Arm Band Phone HolderNathan SonicMount Arm Band Phone Holder Stay connected and on the go with the Sonic Mount. A new universal smart phone armband. Smart phone will stay in place and bounce free thanks to an engineered stretch elastomer and no slip side grips. A convenient and practical storage option for most smartphones. Width adjustable from 5. 8 cm 7. 6 cm depth adjustable from 0. 7 cm 1. 3 cm. Center stretch elastomer No slip side grips keep phone securely in place