The hybrid mug is the perfect mug – keeps hot drinks hot and cold drinks cold for hours. Made from stainless steel (and no BPA!), it has 360 degree drinkability. You can drink from it anywhere around the edge – no struggling to find the “spot.” With the top cap on, it is leak proof. Just how you want them. The hybrid mug comes with a tea infuser for loose tea and travel case and it is sized to fit into all car drink holders.