One sewn outside seam. Higher durability than "heat-sealed" or "radio frequency sealed" seams. No outside binding for children to pick at or tear loose. Tyvek® name tag sewn on end. Made from high density D31 foam and 10-mil vinyl. Meets the strict CA Fire Code #117. 3-Section Standard Rest Mat, 2" x 24" x 48", Blue. Kids will love to curl up on this soft, embossed 10-mil vinyl! 1 Year Warranty.