Smartshake Insulated Steel, Black

Double Wall Vacuum Insulation Protects Temperature for HoursWide Opening and Curved Bottom Makes Cleanup that Much Easier18/8 Pro-Grade Durable Stainless Steel WallsLeak-proof. 100% Guaranteed by our Smartshake™ WarrantyStay cool all day. Nobody needs a warm protein shake. With this double wall insulated steel shaker from Smartshake, you’ll keep your drink ice cold for up to 6 hours. Inside, you’ll find volume markings in both milliliters and ounces, and a curved bottom that prevents protein powder from sticking and makes cleanup that much easier.