Two ventilated mesh ports coupled with an underfoot air circulation system allow your Quark Pro-Airs to truly breathe with every step you take, keeping you cool and dry all day long. Dryz Moisture Management in the footbed keeps feet from encountering any uncomfortable dampness, so you stay feeling fresh and clean. Grip-stop rubber tread gives you the edge on any surface, wet or dry, smooth or slippery, with outstanding hold. The James Test Certification for slip resistance rating is an outstanding .92!!