?Keep Your Water Cool? The ROCKBROS bike water bottle is designed with aluminum foil to keep your water cool for up to 3 hours during outdoor summer cycling. ?No Leaks, No Problem? This fully enclosed cycling water bottle ensures that no water will leak, giving you peace of mind as you ride. ?Easy to Use & Lightweight? Open the bicycle water bottle easily with just your teeth or one hand. Weighing only 0.28 pounds, this cycling bottle allows you to stay hydrated without adding extra weight. ?Clean & BPA-Free? Our insulated bike water bottles are made of easy-to-clean plastic and are 100% free of BPA, BPS, and BPF. ?Ride Longer, Hydrate Smarter?At ROCKBROS, we fuel your adventures. Our 24OZ bike bottle holds 30% more than standard sizes, keeping you refreshed mile after mile.