The evolution of protection continues in the Troy Lee Designs Speed Knee Sleeve Guard, which combines high-quality impact protection with a light weight chassis. Light and unobtrusive, the Speed Knee Sleeve is just what you need for everyday trail riding, and a great alternative to forgoing the knee pads altogether. Four millimeter D30 foam covers your knee cap and the top your shin. For those unfamiliar, D30 is a magic material that is soft and flexible until it encounters an impact. Then, the D30 foam stiffens up, absorbing and dispersing the impact force, before instantly returning to its pliable state. Holding the Speed Sleeve in place is a silicone thigh gripper cuff, along with the stretch fit of the Sleeve itself. The Sleeve itself is made of a durable stretch polyester. For non-restrictive, light-duty protection, look no farther than the Troy Lee Speed Knee Sleeve.