20-ounce capacity (note: measurements only go to 18 ounces) glass shaker bottle for mixing protein shakes, smoothies, and supplements Features a 316 surgical-grade stainless steel BlenderBall Whisk that mixes when the bottle is shaken, for smooth shakes in seconds Protective silicone boot prevents breakage and ensures durability; detachable loop top for easy carrying (breakage can occur from dropping or direct impact to glass)
