Perfect for your next tailgate or camping trip, the Stanley Adventure Stacking Tumblers feature dual purpose different colored neoprene wraps. Not only do they allow you keep track of you drink, they also keep the exterior cool to touch, in case you've opted for a warming beverage this time.The Adventure Tumblers will keep drinks hot or cold for up to 30 minutes or iced for up to 3 hours. For easy packing, just stack the tumblers to save space. Just say no to disposable red cups, and YES to Stanley Stacking Steel Tumblers. Better for you and better for the environment. Rugged construction. Each tumbler contains a colored neoprene wrap that helps you identify your drink and keeps exterior cool to the touch. Conveniently stacks for easy storage. Keeps drinks hot or cold for up to 30 minutes, or iced for 3 hours. 188 stainless steel won't rust naturally BPA free.