Come and Check Our Branding Solutions.The phone holder is made of waterproof material -neoprene and a reinforeced zipper ensures all your items stay dry when you sweat a lot or get caught in the rain .your belonging will stay safe and dry thanks to our waterproof coating and waterproof zipper. The belt of our phone arm band is adjustable , which can perfectly fit for most size of arms from 8 to 16 inches , comfortable and flexible .Special earphone jack designed for listening musics conveniently when running . Pls check inventory and detailed info before placing your orders.