Before use, preheat or prechill your Copco mug by filling it with hot or cold water, attach the lid and allow it to stand for five minutes. This allows the maximum temperature retention. Once the five minutes have passed, drain your Copco mug and fill with your beverage. Polypropylene body, Silicone grip, Polyethylene straw. Measures 3.5 L x 3.45 W x 10.85 H.Low Monthly Payment. Click here to see what your monthly payment would be with your Sears card.