Smooooooth moves. This Allkinds Smoothie Cup is made from stainless steel and is insulated to keep drinks cold or warm, so you can take your favourite drink on the go. Polypropylene lid screws on to keep your drinks inside, a removable straw allows for easy cleaning. Hand wash the cup in the sink with dish soap and warm water to clean, air dry, but you can pop your lid and straw straight in the dishwasher to wash those excess drinks away.