Brew KeepCup has a Press fit lid, is lovely to drink from lid on or off.They Natural cork band feels and looks great It’s made from Durable tempered glassDrafted vessel for easy pour. About the cork: Natural, renewable and biodegradable, cork is one of the most sustainable materials on earth – it’s harvested from living trees. KeepCup bands are upcycled from the waste by-product of wine cork production in Portugal. The bands are water resistant, antibacterial and heat resistant. The cork is bound using a vegan food grade polyurethane. The bonding material is 8% of the product, we are currently validating that the cork can be buried or biodegraded in household compost at end of life. Care: - Designed to be taken apart for thorough cleaning.- Handwash only.- Heat to 100°C / 212°F. Lid off only.- One-year warranty on defects and faults