Our specially formulated Solexx greenhouse panels are a polyethylene blend and not polycarbonate. Insulated Solexx paneling is available only on Solexx Greenhouses. The covering is insulated to cut down heating and cooling costs, but most importantly, you get more light diffusion than is available with other types of covering. University tests have shown that plants grow better under diffused light. Another feature that makes us different is our built-in bench frames. With almost all other greenhouse kits, benches are a large additional expense. Also we include full-length hanging rods to overwinter hanging baskets.