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 is your last bottle. The 40oz is the same width as our 32oz, just taller. Comes pre-loaded with our new 2.0 Fully Insulated Flip Top Lid. 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.