the coldest water bottle 32 oz wide mouth insulated stainless steel thermos - cold up to 36 hrs/hot 13 hrs double walled flask with strong cap (black, 32 oz) the coldest water the coldest water sports series premium water bottle was initially built for professional athletes in high performing sports. we believe in only owning 1 water bottle and it being your last bottle. loop lid for easy twist off and bigger gulps. the advantages of owning the coldest water bottle -cold for at least 36 hours -technology -floats in oceans and pools -rubber grip and big handle for carrying -perfect size - not too big, not too small! -durability -very strong and solid build -fit big ice cubes -tight,. light-weight, yet strongest durable water bottle build. the coldest water bottle is made out of thick stainless steel.