With proper care, oilskin hats can last 10 or more years, depending on use and care. The heavy-duty cotton construction is durable, and re-waxing the fabric as needed can help maintain its water resistance. The fabric develops a worn, personalized appearance over time while maintaining its protective qualities. Conner Hats' Limited Lifetime Guarantee covers workmanship failure for purchases from connerhats.com: during the first 12 months, it provides a free replacement of the same style, size, and color, with shipping paid. After 12 months, a 40% off replacement code applies, with shipping not included. Material degradation qualifies for a 30% off code. If the hat is lost or stolen, the guarantee offers 50% off the same hat.