Pump iron and then enjoy smooth, delicious protein shakes with the BlenderBottle Strada 24 oz Insulated Stainless Steel Bottle. Constructed with durable stainless steel, this bottle uses double-wall vacuum insulation to keep drinks cold for up to 24 hours, while the BlenderBall® wire whisk breaks up clumps for smooth drinking. The rounded base prevents protein powder from settling, and push-button open and snap-shut closure deliver a leak-proof seal.