Created with bamboo fibre, Ecoffee Cup is BPA and phthalate free. It feels a bit like thick, yet super-light cardboard; hard to believe it can hold hot liquids. The lid and sleeve are made with matte food-grade silicone which is designed especially for hot liquids. It has a re-sealable no-drip lid, making it perfect to take with you everywhere you go. The whole product (cup, lid and sleeve) is dishwasher safe and should last for years if you treat it nicely; of course it can break if you treat it roughly and it is not suitable for microwave use.