Evolution DST PantsFly Evolution DST Pants DST (Durable Stretch Technology) constructed of four way HEX Stretch fabric provides excellent mobility with heavy duty durability Strategically placed stretch mesh ventilation and laser cut perforations in key areas for advanced airflow Leather heat shield panels fastened with high tension, heat resistant DuPont Kevlar stitching Seat panel sewn to breathable light mesh reduces pulling Advanced Lycra liner adds increased