The perfect addition to your outdoor dinnerware is the Blue Sky Gear
Double Up Cup. This attractive yet durable cup is designed for use with
both hot and cold beverages. It features a hard anodized aluminum outer
cup and a BPA-free, food-grade silicone lining. The two can be used
together when drinking hot beverages, or can be used independently when
drinking cold beverages. The cup can withstand temperatures up to 300F
and features a capacity of 10 fl oz. Both are dishwasher safe.