2XU Compression Calf Guard 2XU Compression Calf Guards Lighter than calf sleeves, the 2XU Compression Calf Guards are great for training or competitions. Extremely powerful, breathable and engineered with UPF50+ sun protection your legs will definitely thank you! The 2XU Compression Calf Guards is constructed with PWX FLEX which uses a 105 denier fabric to deliver optimum flexibility and breath ability to support the shin and calf muscles. High filament yarns work to actively and efficiently wick away the build-up of excess sweat and moisture to keep your skin cool, dry, and comfortable as you strive for the best results and performance.