The running belt is made of high-grade polyester fiber skin-friendly material, no odor, light and thin, breathable and quick-drying, waterproof and sweat-wicking, and effectively dissipates sweat from the waist. The M size is suitable for people with a waist circumference of 25-33inch, and the L size is suitable for people with a waist circumference of 33-43inch.The fit is snug and not loose when running.The fanny pack is equipped with a 300ml sports water bottle, with a tailor-made arc, allowing you to wear it closely and comfortably.Multi-pocket design, wrap-around elastic expandable pockets to meet your daily needs, and waterproof and sweatproof lining on the inside of the pockets, so you don't have to worry about getting your phone wet.