Wear Zoot's Ultra CompressRx Shorts on your rides and perform at your best. Zoot consulted doctors in the field of medical compression and came up with a circumference-based fit system so you not only get the perfect fit, you get the right amount of compression. The result is CompressRx graduated compression technology which surrounds your muscles to help stabilize them, increasing response and reducing vibrations and micro-damage that lead to post-exercise soreness. After exercise, these shorts reduce edema and encourage blood flow back to the heart which flushes lactic acid. Made from lightweight polypropylene with SilverTech, they're 99.9% antimicrobial, breath well and transfer moisture for a comfortable, odor-free fit.