Since it appears that most outdoor sectional sets are made from resin wicker, it pays to know the basic differences in quality. Resin is one of the best materials for outdoor furniture because it’s durable, low maintenance, and easy to move around. Resin material is typically placed on an aluminum frame for extra durability. There are different grades of resin, and you may not be able to tell at first glance, or even from the literature, which type you’re selecting. If you can, try to purchase high-density polyethylene (HDPE) wicker or polyethylene (PE) rattan or wicker. HDPE is a higher grade of resin than the lower-grade PVC wicker. HDPE resin wicker is nonporous, infused with dye, and treated with a UV stabilizer for extra protection from the harsh sun. HDPE resin will unravel or crack much more slowly than PVC. Another way to eyeball quality resin: cheaper wicker strands have a smooth, glossy finish that tends to look more like plastic than wicker.