With Bivos all new Dirt Cap, you can be sure the clean Bivo taste wont get stuck in the mud. Going for a ride in dusty, dirty, muddy conditions? Toss on Dusty the Dirt Cap to any of our bottle nozzles, and enjoy your favorite taste without any unwanted ingredients. The flexible silicone allows for quick and simple installation. Utilizing a simple design and high quality silicone, Dusty the Dirt Cap provides the protection you need without compromizing nozzle funtionality. It can easily be popped off for a drink with the flick of your thumb and secured back in place with one hand. Weighing in at just over 4 grams, this little companion punches well above its weight.