2XU Calf Guards Size Chart The 2XU Cycle Knee Warmers provide protection against the elements. They are engineered with Italian high performance thermal and breathable fabrics that allow moisture to be wicked away from the body, keeping your knees warm and dry. A perfect accessory that can be used for warm-up and removed as needed. Features: - Brushed inner for unparalleled thermal comfort - Outstanding moisture management - Easy to pull on and off as needed - Provides extra length to shorts to create 3/4 length coverage