Swela’s 37+ marine canvas is made of 100 percent spun-dyed polyester, with durability engineered for adverse climates. The high-tech, PVC-free fabric is durable and made of fully recyclable material. The 37+ will not leak even after a week of standing water, and will return to its original shape if distorted by heavy wind and water. The fabric will not fray after being cut, so a project can be finished with a raw edge. The yarns are treated with UV inhibitors, anti-fungal agents and Teflon™ for minimum maintenance and protection from sun and sea.