MuckguardÖ protects SurgeÖ valve from whatever the trail dishes up ù opens and closes with one hand and seals valve when closed Spill-proof when open and pushes closed for leak proof transport, Breakaway Surge valve maximizes flow rate and self-seals to eliminate spills and splatter 15 oz. size designed with mountain biking in mind ù built to fit any frame size and/or full suspension bike with limited real estate for bottles 100% BPA-free insulated water bottle featuring a sleek, single-wall design that is light, durable and compact Designed with ultra-light materials and a unique grip groove so you can hydrate with an easy squeeze Twist, pull and washù Surge cap is a dishwasher safe, easy to clean two piece cap and valve Materials include low-density polyethylene (LDPE) and thermoplastic polyurethane (TPU) valve. BOTTLE SESSION NAVY 15