These Poly-Pillow Footpacer Footbed insoles are made with a polyester lining that wicks away moisture, giving you drier, cooler and healthier feet, no matter what time of year. The shock absorbing Thorogood removable insoles are designed to reduce fatigue, and have built-in arch support, which is critical for your feet and back giving you maximum stability and comfort. The polyurethane Postal footbed provides you with excellent impact absorption.