DURABLE & STYLISH Made with high-grade stainless steel for long-lasting use. THERMAL EFFICIENCY Double wall vacuum insulation keeps drinks hot or cold for hours with pre-heating or pre-cooling. 12 hours cold and 8 hours hot. No sweat exterior. ECO-FRIENDLY DESIGN Reusable and BPA-free. PORTABLE Lightweight with a silicone rope for easy carrying. SAFETY & MAINTENANCE This bottle is FDA approved, dishwasher safe, and should be washed after each use.