insulated mug 900ml. Thermos with a durable outer wall made of RCS certified recycled stainless steel and an inner wall made of plastic. 90% Recycled stainless steel and 10% PP plastic.. It has an integrated food-grade silicone straw and a splash-proof push-on lid for a smooth drinking experience. This thermos is also suitable for hot drinks, but it is not recommended to drink them using the straw. To let your drink cool, remove the lid before consuming it. Hand wash only.