Ultra-thin Exercise Bag's Lycra material is moisture wicking, quick dry , stretchable, lightweight, and great softness against your skin. Fits 25.9 - 42 inches waists with fully adjustable elastic strap. Strong adjustable elastic waistband ensures it bounce free. 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. Size:8 1/3" L x 4 3/4" W x 7/8" H