The Compressport R2V2 Compression Calf Guards come with an ergonomic tab, K-protect, which supports the patellar tendon and shields your knees from vibrations, cutting them by 8%. They limit pains and aches, both during and after extertion, therefore delaying fatigue and speeding recovery. Total performance is guaranteed over ultra-long distances. Latest version. Features: Version 2 of the world's best selling calf guard Features seamless multi-gradual compression and superb durability and strength Reduces build-up of lactic acid during effort Minimises muscle vibration, boosts performance and helps prevent injury Makes legs feel fresher and last longer Features the K-protect ergonomic tab for additional knee support Sizing guide: These are measurements of the circumference of the calf at its widest part. T1 (small) 30-34cm T2 (medium) 34-38cm T3 (large) 38-42cm T4 (XL) 42-46cm