The Transit Fliptop travel mug by Stanley is made from recycled 18/8 stainless steel and silicone. AeroLight™ technology makes the mug up to 33 % lighter than ordinary stainless steel mugs. The double-wall vacuum insulation keeps drinks hot or cold for several hours. The leakproof lid has a flip tab that can be opened and closed quietly. The mug also fits in most car cup holders. A practical travel mug to take on your commute or a trip to the woods.