CW-X Men's Endurance Pro Muscle Support Compression Tight 100% Nylon The Endurance Pro Tight offers our patented support web for hamstring, calf and lower back areas with additional targeted support around the knee to reduce the additional shock and load from running. CW-X offers benefits for all three areas of our Conditioning Cycle: PREPARE: (warm-up), PERFORM: (endurance), RECOVER: (accelerates recovery form workouts) Breathable and Wicking Coolmax material which pulls moisture away from the body to keep you cool and comfortable. Variable Compression for faster warm-up and quicker recovery. Reflective logo increases visibility in low light conditions