These compression calf sleeves will make the difference on the 2017 edition of IRONMAN®! Fitted with a K-Protect tab that supports the patellar tendon, vibrations are absorbed by 8%, fatigue is delayed and muscle damage is minimised. Your knees will be under constant strain if not geared in the adequate compression apparel. The R2V2 is ideal on such a long-distance race. It also helps a weak knee to perform.