Quoted from the official website below: ◆TAVARUA POLYTANK COVER◆ A hot polytank cover made of highly insulating neoprene. This 12-liter size is convenient for carrying and keeps hot water warm for a long time. It's an all-in-one design that can be used without removing it from the case, and the cover is sold separately. The original pattern switching is a key feature. 【Size】Can store a 12L polytank. 【Material】Neoprene material TAVARUA Surf Hat company 《Mission》UV care and supporting goods for all water sports lovers. "To provide UV care and supporting products for all those who love marine sports." 《Vision》Continue the long-loved No.1 surf hat brand. "To be the No.1 surf hat brand that continues to be loved for a long time." 《Value》Originality, High-Quality, Functionality "Aiming to create products with originality, high quality, and functionality." Easy to install with Velcro and zipper. Convenient to use without removing it from the case. Can be washed with water if it gets dirty. ※Polytank is not included.