The seams of this item are triple-stitched and the perimeter batten is made of a PVC material. This sails is intended for larger, heavier boats that need and can handle more power from the wind. This sail retains its shape in high winds and doesn't turn a kayak or canoe into a complex, heavy sailing craft. Features - Material: PVC. - Size: Approx. 108 * 108 * 1cm/ 42.5 * 42.5 * 0.4 inch (L*W*H). - High quality for durable and long-lasting use. - Lightweight for portable carry. - Compact design, durable in using, folds up small (40cm's) so its easily stowed when not in useeasy to set up and deploy quickly. - Diameter of sail is a huge 108cm's, shades from the sun during trip. - Can speed up paddling significantly, great for Kayaks, Canoes, Inflatables, Tandems and Expedition boats. Package Including 1 * 42 inches Wind Sail Kayak Canoe Paddle Accessories Board Kayak Downwind Popup Kayak Sail Accessory Easy Setup & Deploys Quickly