DonJoy Performance WEBTECH Knee Support Brace for Men and Women Knee Pain Relief Support with Compression Undersleeve Silicone Web Technology with Silicone Web Technology: Black, Medium - 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