Wear Zoot's Ultra CompressRx Tri Shorts on your rides and perform at your best. These active shorts use Zoot's ZoneRx that has specific zones of compression that surround your muscles to help stabilize them, increasing response and reducing vibrations and micro-damage that lead to post-exercise soreness. Zoot consulted doctors in the field of medical compression and came up with a unisex, circumference-based fit system, so you not only get the perfect fit, you get the perfect amount of compression. Made from lightweight polypropylene with SilverTech, they're 99.9% antimicrobial, breathe well and transfer moisture for a comfortable, odor-free fit. Plus, the SBR 1D pad provides comfort on the bike.