20 Year Lexan Thermoclear Polycarbonate Warranty 15 Year Warranty against damage from hail: 8, 16 Clear & Softlite – 25mm Softlite Thermoclear “15” & 16mm X-Wall Sun XP. PLUS! – 5 Yr Extended Warranty against damage from yellowing (Supersedes the 15 yr – Offering 20 YEAR against yellowing)