High quality eco-friendly material, light weight, foldable and stretchable, breathable, fine texture to help absorb sweat. The sweat-resistant lining lets your skin breathe and keeps your phone dry at all times during all activities. This sports armband fits 4-6" phones, and the running armband features two large space arm pockets to keep your phone, keys, cards, lighters and Snickers closed while you exercise. Built-in headphone jack: Pass your headphones through the headphone jack on the botte fastening lets you adjust them to fit your body shape.