Low-profile baselayer guard with D3O impact protectionThe Baseframe Pro Short Sleeve D3O 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 conditionsRemovable CE certified D3O® Viper™ back insert features world leading impact protection technologyLarge perforation and flex grooves in the back foam contours and flexes with rider movementEN1621-1 Level 1 D3O® shoulder inserts for additional protectionBody heat activates (softens) the polymer to conform to bodyMoisture wicking, open stretch mesh for breathabilityCERTIFICATIONSExceeds EN1621-1 level 1 back certificationEN1621-1 level 1 shoulder inserts for additional protectionNote: No technology or product can fully prevent the risk of injury or death