Practically nonabsorbent, HDPE won't swell when exposed to moisture. It is denser and more rigid than LDPE, plus it's more chemical resistant.

Also known as pipe-grade HDPE, these sheets are about four times more impact resistant than standard HDPE and hold up outdoors, and in wet environments.

Composed of high-density polyethylene fibers, this durable material is tear and water resistant and keeps its high strength in both wet and dry environments.

Get the look of wood without having to worry about splintering or rotting.