Stay hydrated and keep pedaling with the Fox Head Base Water Bottle. It features a hands-free valve for easy on the bike refueling - so you don't even need to pull over. The 100% leak-proof design ensures the water is for drinking only, not dirtying up your front derailleur or crankset. Simple hands-free open and close valve 100% leak-proof top locks down for transport or mixing powdered drink Simple hands-free open and close valve 100% leak-proof top locks down for transport or mixing powdered drink 21487-001-OS