The material is lightweight so you almost cannot feel it when you put it on. Fits 25.9 - 42 inches waists with fully adjustable elastic strap. Strong adjustable elastic waistband ensures it bounce free. For most of smartphones, passport, keys, credit cards, money, energy gels. Ear bud hole is for pleasant music in running. It is great for all forms of exercise including walking, running, hiking, riding bikes, working out at the gym and more. Keep your valuables dry while you are doing exercise, not exposure to a lot of water or rain for long time.