Chafe free Glideskin Collar Soft subtle collar seal, water tight comfort. 50% Airlite Superflex G3 Super flexible Nylon spandex jersey´s laminated to an airlite foam core. This material is incredibly flexible yet durable. Flat lock construction Contour Flex Strategically placed under arm and side panels for maximum flexibility. Chafe free strategic seam placement 3D Molded Supratex Knees Abrasion resistant 3D molded knee pads for flexibility and durability. Zip Strut Removing any stress applied to the zip head, a small but important solution to any abuse to the zip. #10 YKK metal back zip entry Internal key loop