SumacLife PU Leather Workout Armband for BLU Energy X/BLU Studio Energy 2 / BLU Vivo Air/BLU Advance 4.0L, Black SumacLife hardcore workout armband with key slot and earphone cord excess holder Premium nylon construction is tough and durable to withstand any workout routine Unique neoprene closing flap with Touch fastener locking keeps your phone secure and inside the armband Touch fastener strap can be adjusted to a more comfortable fit / Touch screen friendly clear window