Radial Aramid Laminate - Racing Mainsail
Aramid fibers such are Kevlar, Twaron and Technora are the most common performance yarns used in sailmaking. As seen below, they are much stronger and have much less stretch than polyester yarns and they are less expensive than the top-of-the-line carbon and Spectra yarns. Sails constructed with a aramid fiber reinforced laminates hold their shape well enough for most racers.
Radial sails (with their many panels) allow sailmakers to use more than one style of laminate in a sail. Stronger laminates can be used in high load areas like the leech and tack, while laminates with less strength can be used in the luff of the sail. Using these materials helps reduce the weight and price of the sail.