evo.com | Fox Racing Body Armor > The Fox Racing Baseframe Pro SL Baselayer is built to keep you protected without holding you back. Breathable mesh helps you stay cool, while flexible Koroyd inserts provide impact protection across the chest and back while moving naturally with your body. Designed to fit comfortably under your jersey, it's the confidence boost you want when the trail gets rough. Mesh Fabric for Maximum Breathability EN1621-3 Level 1 Koroyd Chest Protector Bonded Collar with a Wide Neckline for Comfort and Seamless Integration for Under Jersey EN1621-2 Level 1 Koroyd Back Protector Compression Side Panels to Secure the Guard Inserts and Maintain Close to Body Fit | Fox Racing Baseframe Pro SL Baselayer 2027 - X-Large in Black