We build from a 5.93 ounce dacron cloth from Challenge Sailcloth. Here's a link to the cloth specifications: Challenge Sailcloth specifications This cloth is a high-performance cloth that has near racing cloth performance without being too hard to handle. Includes: Sailbag, R19 insignia, Sail Numbers, Telltales and Battens. Availability: Usually ships the next business day. R19MRegular price: $399.99Sale price: $299.99 Due to the wide variety of the size and weight of our items we will charge the actual cost of shipping in a separate charge on all orders. Please email us for a shipping cost estimate. Shipments outside the USA may have add on fees and duties by your own government. Sailing can be green! See our recycle your old sail offer Send us email