Swell Blue Fluorite Bottle - Known as the “genius stone” for its ability to enhance the intellect, this cool blue is quite literally brilliant. THERMA-S’WELL™ TECHNOLOGY: Keeps beverages cold for up to 24 hours and hot for up to 12. TRIPLE-WALLED: Vacuum-insulated, high-grade 18/8 stainless steel. ECO-FRIENDLY: BPA-free and reusable. NO SWEAT: Condensation-free, the exterior will remain dry. 17 oz. size