The handheld's ergonomic configuration allows your hand to relax to a natural position - eliminating hand cramping and tension. The strap is a combination of our AirFlow mesh on the outside and a soft, wicking inner layer which doesn't trap sweat. The quick-adjust strap allows for a custom fit. Comes with a custom molded 20 oz. Hydraform Bottle. The thermal-lite version keeps your drink cooler and your hand dry! BPA free.