THE [MOST COMFORTABLE ARMBAND]: Unlike all the bulky and uncomfortable armbands on the market, we made our armband without the uncomfortable plastic and Velcro components that other Armbands have. Our Armband are made with our custom high end, lightweight, breathable performance fabric which stretches to FIT ANY SIZE PHONE with a case. SIZES FOR BIGGEST AND SMALLEST ARMS (4 comfortable sizes) - Small arms? We have your size. Very large arms? We have you covered too. To receive the most accurate size, please measure your bicep and choose from the following sizes - SMALL (7 inches to 9.5 inches) MEDIUM (9.5 inches to 12.5 inches) LARGE (13 inches to 16 inches) XL (16.5 inches to 19.5 inches) THE ONLY ARMBAND WITH [BUILT IN GRIP DOTS]: Goodbye to chaffing, pinched skin, slipping and sliding! Just enter your phone and other valuables into the armband and slide it up your arm. Our grip dots will keep your armband leaving you hands free and comfortable.