The Baseframe Pro Short Sleeve is a breathable baselayer with built in guards on the shoulder. It\\\'s designed to be worn under your jersey for low-profile coverage. It includes a removeable back insert, increasing your impact protection, while the fabric wicks away sweat as you ride and keeps you cool. The Baseframe Pro will fit snug and secure-the polymer softens to conform to your body as it is warmed by your own heat-offering minimal restrictions and maximum benefit. The more you ride, the better it feels. Exceeds EN1621-1 level 1 back certification including high and low temperature conditions Removable CE certified D3O® Viper™ back insert features world leading impact protection technology Large perforation and flex grooves in the back foam contours and flexes with rider movement EN1621-1 Level 1 D3O® shoulder inserts for additional protection Body heat activates (softens) the polymer to conform to body Moisture wicking, open stretch mesh for breathability Exceeds EN1621-1 level 1 back certification EN1621-1 level 1 shoulder inserts for additional protection