This eco-friendly, reusable travel mug is made out of durable bamboo fibre and comes with a matching silicone sleeve and lid for keeping hydrated (and caffeinated) on the go. Dishwasher safe mug with hand wash only lid and sleeve. Do not microwave. Our BPA-free eco bamboo products are made of 40% sustainable bamboo fibre, 40% resin and 20% corn starch.