Rust and corrosion-proof polymer material. Legs have a larger radius than traditional dunnage racks and distribute the storage load across a wider area. Racks join together easily without tools in "end-to-end" and "back-to-back" configurations with the exclusive Bow-Tie feature. Built-in Microban antimicrobial protection inhibits the growth of bacteria, mold, mildew, and fungi that cause odors, stains, and product degradation.