The Cell™ Knee Protection System is built on more than 10+ years of time-tested and proven designs. Several patented revolutionary design concepts come together in unison to create this System: the A.R.C. Cuff has the ability to be totally adjustable for fit, yet remain rigid; simple, low profile strapping features a single finger release; a natural free-motion, rolling-gliding hinge follows the natural movement of the knee; carbon fiber matrix, tibial plateau-capturing frame design provides strong, yet lightweight protection: brace-to-boot tether attachment helps prevent lower leg rotation; plus the full-time, full-coverage patella cup offers superior coverage. This Knee Protection System is truly decades ahead of all the rest. Undersleeves and Tethers are included.