Nylon.LARGE CAPACITY & CONVENIENT: Our fanny packs is well constructed with 4 separate pockets, ideal to organize your essentials separately. Storage for any cell phone( iPhone 12Pro Max/11 7 8plus,Samsung Note), passport, power bank, water bottle, keys, small purse or other valuable items.Creative Phanny Pack Theft-Proof Back Pocket — Theft-Proof Hidden Zippered Pocket - on the back side is great for you to Keep Your Valuables Away From the Thieves,Specially Valuables.Druable Water Resistant Material: High quality Nylon materials are applied on this fannie packs for women & men, which makes it durable, scratch resistant while with light weight.Ensure a secure & long-lasting usage.VERSATILE & COMFORTABLE: Adjustable webbed strap fits from 34" up to 48" around. Easily and quickly adjusts to whatever length you need and will remain at your chosen length without loosening. Allows for different wearing styles that can be worn on your hip, Crossbody ,shoulder or tight under your arm..Suitable Occasion: Our waist pack is for men, women, older,and teenagers to camping, jogging, running, walking, hiking, cycling, exercising, walking the dog. It is also a great gift for friends and family