Minimal restrictions, maximized benefits. 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 and elbow inserts for additional protection Body heat activates (softens) the polymer to conform to body. Moisture wicking, open stretch mesh for breathability