Please refer to the product description section below for all applicable legal disclaimers denoted by the bracketed numbers in the preceding bullet points (e.g., [1], [2], etc.) A durable, waterproof band made of pliant synthetic rubber, so it's comfortable. And with perforations, it's breathable and great for workouts A comfortable, waterproof band for gym day and every day Silicone band with plastic clasp and stainless steel lugs Active Sport Band is sweat and water resistant, with perforations to make it breathable Comes in small and large band sizes; small fits wrists 130-175 mm around and large fits wrists 165-210 mm around