Used DonJoy Performace Medium Knee Brace w Compression Undersleeve Black Black White Green Designed for fastpitch UltraCool ventilation Bat Specs BESR Certified Designed for fastpitch UltraCool ventilation Double knee design Wraparound sides AEGIS Microbe Shield 14 All of this and it still maintains weight distribution for a balanced weight score NO SLEEVE BOX TORN Silicone web technology helps absorb shock and shift loads from the painful area of the knee Dual Axis hinges work with the web for improved fit and articulation Compression molded back pad with mesh for maximum comfort and breathability Undersleeve with stash pocket and anti migration technology Reflectivity for enhanced visibility in low light conditions