Tervis Tumblers - Butterflies - 16 oz Tumbler - set of 4 $4.99 SHIPPING for your Entire Order! Unconditional Lifetime Warranty High grade polycarbonate makes Tervis the strongest, most durable drinkware available today Polycarbonate is not only durable but also crystal clear; no clear drinkware looks or wears better Doublewall insulation keeps hot drinks hot and cold drinks cold