OPTIMIST Durarace sail, designed for children under 45 kg, made from Challenge fabric, 4.18 oz. slightly heavier than the fabric used for racing sails, but much more durable. - - OPTIMIST Durarace sail, designed to learn to go fast, for children under 45 kg, made from 4.18 oz. Challenge fabric, a little heavier than the fabric used for racing sails, but much more durable, same cut as Racing sails, 6 fabric surfaces, horizontal cut, window, penons, storage bag for furled sails, bevelled battens, vectran rope for solid attachment, IODA control. Optimist Durarace LITE sail Windesign DESCRIPTION Durarace Sails from Windesign are built for durability and speed! Made of 4.18 Challenge sailcloth. A bit heavier but much more duarable than sailcloth used in most racing sails. Easy to trim 6 panel horizontal designs, with tapered sailbattens, IODA button, telltales and window installed. It comes rolled in a long sail bag. The Windesign Durarace LITE sail is suitable for sailors under 45 kg (99 lbs).