Performance : Unique Double Walled Vacuum Insulation Technology With Vacuum-Seal Cap Keeps Your Drinks Cold Up To 24 Hrs And Hot For Up To 12 Hrs. Intimate Design: Specially Designed Cap To Prevent Spills, Wide Drip-Free Mouth Opening For Ice Cube Insertion (Diameter: 1.42) Security: High-Quality Food Grade 304 Stainless Steel On Both Inside And Outside Walls, 100% Bpa Free For Health-Safety. Further Information: Lightweight Design, Perfect For Your Fitness Packs, Cars, Bikes And Backpacks To Enjoy Your Long Walks, Hiking, Hot Yoga Classes, Prolonged Travel Or Any Other Outdoor Activities.