Attention Runners! Buy the 13.1 or 26.2 Tervis Tumblers in 16 & 24 ounce double wall insulated drinkware. Tervis Tumblers keep hot drinks hot and cold drinks cold. They are dishwasher safe, microwave safe, freezer safe and they even float. Made in the USA, Tervis Tumblers come with an unconditional lifetime guarantee.