Designed by Sidas, the Ultralight Run Calf are perfect leg warmers to relieve your muscles during long distances. These Ultralight Run Calf leg warmers will stabilize your muscles during exertion and thus improve your recovery. With hydrophobic fibers, the Ultralight Run Calf ensure excellent sweat management for total comfort. In short, these Sidas leg warmers will be valuable assets for tackling an ultra-trail!