Reduce your waste from the coffee shop with the Hydro Flask Flex Sip Coffee Mug! Made from 18/8 pro-grade stainless steel to ensure pure taste and no flavor transfer, this eco-friendly reusable coffee mug fits under most coffee brewing systems, and has a leak-proof lid with a smooth flow opening. The TempShield™ insulation eliminates condensation and keeps beverages cold up to 24 hours and hot up to 12 hours. Plus, it's BPA-free and phthalate free!