Hidden Pocket Arm Sleeves, This product will help you solve many problems.You won’t miss the important calls when you are doing sports.The phone won’t fall out and break during running., Perspiration and breathable fabric Using wicking and breathable fabric, it is cool and comfortable when you use it., Seamless zipper bag design Seamless zipper bag design, can hold mobile phones, cards, change, etc., Anti-slip Anti-slip silicone strip sewn on the inner side of the upper circumference to prevent slipping when wearing., Wide range of applications This product has wide range of applications. It can be used when you are doing body building, running, riding, etc., Product Specification, Color: Black Size: S-2XL Applicable age: adult Fabric: nylon Material: nylon (80% Nylon + 20% spandex) Weight: about 25g