Whether for illumination or aerodynamics, a TerraCycle brand TailSok is a great investment for your bike. Our TailSok Frames are made through a combination of sturdy tubing, reliable clamps, tough, yet forgiving urethane, and homemade CNCed clamps that weigh little but grip harder than a late pizza delivery boy in rush-hour traffic. All TailSok Socks are lightweight, stretchy Lycra fabric with super reflective exteriors. Light up the inside and the outside with the optional TailSok Light Mount for heightened visibility in the darkest conditions. And add a TailSok Bodywing to take your aerodynamics to the next level! Whatever the reason, you'll be sure not to regret the TerraCycle TailSok!