The Fox Baseframe Pro SS Chest Guard delivers minimal restrictions and maximized benefits.?The removable CE Certified D3O® Viper™ back insert of the Fox Baseframe Pro SS Chest Guard features world-leading impact protection technology.Fox Baseframe Pro SS Chest Guard FeaturesExceeds EN1621-1 Level 1 Back certification including high and low-temperature conditions?Removable CE Certified D3O® Viper™ back insertLarge 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 the body?Moisture-wicking, open stretch mesh for breathability