Developed from the Tacks design, the new Tacks offers the same fit and level of protection. With improvements across the line and more D30 Smart Material to enchance the level of protection. It's taking the Tacks line to the next level. Molded PE Insert Anatomical Calf Wrap PE Cap with Reinforced D30 Lite Knee Anatomical Design with D30 Lite Shin Cap Wraping Lock Strap Anatomical Removable Liner with Segmented Velcro Shin Padding and Knee Cut-Out