EcoVessel â„¢s Boulder bottle offers 72 hours of cold or 14 hours of hot. It features a vacuum center and a durable stainless steel outer with a protective bumper bottom. TriMax Triple Insulation keeps your liquid hot or cold along with the Reflecta TM insulated lid. The dual opening lid allows easy filling while the silicone lip provides drinking comfort. The Boulder is equipped with a strainer and a sturdy flexible strap for attachment and easy carrying. 3balls.com online store offers the best value and quality for your EcoVessel golf Accessories needs.