●Size: 3.3 - 3.9 inches (8.5 - 10 cm) / XS (Kids) ●Material: Food Grade Silicone/Plastic ●Set Includes: Main unit, storage pouch, replacement packing ●Do not use in bad weather or in rapid flow. Do not act alone, please use at least 2 people ●Please refer to the size of the product and choose the size that best fits you. Size inconsistencies are often caused by water leaks and clouding during use