The foldable Sea to Summit X-Tumbler Cool Grip keeps fingers cool and the mug secure in your hand. The innovative Cool Grip construction uses specially designed slats to protect fingers from the heat of the drink. The rigid rim ensures that the mug remains stable and is light to drink from. The Cool Grip X-Tumbler holds 350 ml - the perfect size for a beer, lemonade, wine or even a warming tea during or at the end of a long hike.