Aero-X fabric uses denier-gradient Nylon/Spandex for great moisture control, durability, comfort and fit. Aero-XT side panel is stuctured for advanced compression and evaporation. Strata Chamois is dual-density, component -welded and sublimated. Flat-seam construction throughout. Improved silicone and sublimated logo hem gripper elastic with quad leg hem stitching. Pocket on the back.