nylon THE RIGHT SIZE: 20LX11WX11H, this gym bag is perfect for gym, sport events, overnight or weekend trip, the size is good to put under seat or on overhead shelf. SEPARATE SHOES&WET STUFF COMPARTMENT: This gym bag with shoes compartment is ventilated with air flow holes to keep your shoes and dirty gear separate with clean stuff. There is one extra waterproof pocket for wet stuff, especially for wet towel or swimming suits which is very convenient and easy to clean. STURDY&DURABLE: High quality water resistant Nylon material together with strong nylon thread so it will never be tore at the seams, we use the top brand quality metal zipper for each pocket so you will hardly meet zippper problems. We focus on every detail to make the whole gym bag higher standard quality. LIGHTWEIGHT&COMFORTABLE: Very simple duffle bag without too many bulky design. Adjustable shoulder strap so you can wear it at the length that works for you or you can take off the shoulder strap and use the handhold straps only, the pad on the shoulder strap makes it easy and comfortable wearing without hurting your neck. AFTER SALES SERVICE: We provide lifetime warranty, please contact us through order whenever you meet quality problem, buy with no worries!