A couple of super heroes and an infamous villain help kids stay hydrated by making their water bottles extra cool. 2.75" diameter, 5.5" high. Crafted of food-grade stainless steel in our exclusive prints and fun colors; no liner needed. Cap is made of polypropylene. BPA- and lead-free. Lightweight, reusable and designed to last a lifetime. Slim design fits most bottle/cup holders.