Built for the long haul. The Endurance Bottle is a 25oz insulated stainless steel water bottle made for trail miles, gym sets, summit pushes, and Tuesday-afternoon hydration alike. This PURE-tier bottle wraps a sassy saying around the same premium build as our top-tier Endurance — fully 18-8 stainless steel inside and out, double-wall vacuum insulation with a thermal copper lining, and a twist-on lid with screw cap and carry loop that's splash-proof and leak-proof for every adventure. Keeps drinks cold for up to 36 hours or hot for 8. No SiSA™ antimicrobial coating on this tier — just attitude and engineering.