Polyester webbing Usually include FDY and DTY, The FDY also called imitation nylon, The DTY looks a bit like cotton. Polyester webbing is a great choice for applications that require lightweight strength and durability. Polyester webbing is resistant, absorbing very little water to help preventd, mildew and rot.It is considered a good material for outdoor use and won't stretch as much as nylon. Polyester webbing is affordable and comes in a variety of widths and styles to meet your needs. Strap works offers standard polyester webbing solid colors or patterns as well as tubular polyester webbing, military spec webbing, seatbelt polyester and bags polyester webbing.