Pro-Air-System -- The shoe that breathes, featuring two ventilated mesh ports coupled with an underfoot air circulation system that allows your Pro-Airs to breathe with every step you take. The Pro-Air-System is designed to keep you cool and dry all day long. Grip-Stop Rubber -- Designed to give you the edge on any surface. Our high performance tread design provides outstanding grip, wet or dry. The James Test for slip resistance rated at an outstanding .92!.Available Colors: White, Black, Navy, Khaki, Bubble Gum Pink, Blue, Lime, Yellow.