Formula 18 means nowaday the mainstream in catsailing. A class with several boat builders, several thousand boats around the World, with a bit of innovation, but competitive on any level. Your catamaran deserves a UV Covers, what the Olympic Champions use now and in the past! After a long day on the water super easy to put on. Perfect for all events and doesn't take a lot of room in the trailer. Elastic, UV resistant, made from 100% polyester Lycra.