S’well®, the original “hydration accessory” bottle, keeps drinks cold for 24 hours and hot for 12 hours all while looking great and doing good. Our iconic satin-finish Bikini Pink bottle not only makes a visual statement—it also shows your commitment to supporting the Breast Cancer Research Foundation. High-Grade 18/8 Stainless Steel. BPA-free. Triple-Walled for maximum insulation, leaving no condensation on the exterior.