I've been asked to post this. Its the latest Acat sail from Ullman Italy. Here what Pablo, Ullman Italy has to say about the sail:

"Both sails are cross-cut construction out of two different materials.
Charlie sail is Kevlar made, while Mitch's is in Pentex. They are both ultrasonic glued with all the joints matching the battens. This gives an extremely good smoothness through the sail."