The Boulder is for those of us who need an extra large travel bottle for both hot and cold drinks. It's a 2-in-1 insulated, double-walled, stainless steel travel companion with a dual-function, leak-proof lid. The lid features a built-in flip-up straw for cold drinks, and a flip-open hot sip lid for coffee or tea. Combine all that with a real ceramic coated interior, which is shatterproof, and an easy carry strap for an ideal take-on-the-go bottle. Hand wash recommended with colored imprints.