Premium 18/8 stainless steel construction ensures durability and corrosion resistance for long-lasting use. Double-wall vacuum insulation maintains drinks cold for 24+ hours and hot for 12+ hours with optimal temperature retention. Ergonomic handle design provides secure grip while the leak-proof straw lid enables convenient sip-free drinking. Large 40oz capacity meets hydration needs for gym workouts, outdoor adventures, or office use. Mirror-polished exterior with sweat-proof coating prevents condensation buildup during use. Precision laser-welded base eliminates seam gaps for enhanced structural integrity. Food-grade materials are BPA-free and safe for both carbonated and acidic beverages. Includes two interchangeable lids (straw and sipper) plus a removable carry loop for multi-scenario usage. Ideal for athletes, commuters, and outdoor enthusiasts needing high-capacity thermal performance. Commercial-grade thickness (0.4mm body/0.5mm base) withstands daily rugged use without denting.