The EVS Slam Combo is sold as a set and includes Option Knee and Elbow Pads and the R2 Race Collar. The ultimate protection combo at a fraction of the price. EVS Option Elbow Pads: Hard molded polypropylene shell. Perforated bio-foam liner for increased breathability. Tri-Y forearm strapping system provides greater support and reduces migration. Extended forearm protection pad. Asymmetric design provides anatomical fit for left and right arms. Sold as a pair. EVS Option Knee/Shin Pads: Hard molded polypropylene shell. Perforated bio-foam liner for increased breathability. Full knee to shin coverage. Reinforced TPR hinge system. Asymmetric design provides anatomical fit for left and right legs.