CW-X Women's Ventilator Running Tights Ventilator panels in the calf and quad areas provide a cooling effect by releasing excess heat from the skin Our Ventilator tight provides muscle and ligament support especially around the knee, calf and IT band The supportive conditioning Web technology provides targeted support to specific muscles and joints where it is needed most Experience less muscle fatigue, faster recovery and targeted support Flat seam construction eliminates abrasion, increases comfort, and enhances fit. used as warm functional primary layer or outer layer depending on weather conditions Flat seam construction eliminates abrasion, increases comfort, and enhances fit.