The Spectra yarns used in radial sails have tremendous strength in the warp direction.
Cloth manufactures make many styles of Spectra laminates for boats from 40-150 feet long. Some have more and some have fewer Spectra yarns, while for the mega yachts, Carbon inserts are also used.
Radial sails (with their many panels) allow sailmakers to use more than one laminated fabric 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.
Cruising Spectra laminates come with one or both sides covered with finely woven polyester taffeta, which improves chafe resistance