Performance under gear has come a long way in recent years as has the sport of motocross riding. In fact, MX is one of the most physically demanding sports around. With this in mind, EVS went to the drawing board to design a line of performance under gear that would meet the demands of MX which resulted in the Cold Weather Technical Under Gear Short-Sleeved Shirt. Eliminates chest protector rubbing. Breathable/wicking fabrics. Muscle compression (proven to add to athletic performance. Comfort/ergonomic cut.