This garment designed to be completely practical and safe the Contrast Bib & Brace protects the lower body and chest against wet conditions while ensuring safety and warmth of our quilted liner. 300 denier is a 100% polyester yarn. It's a tough fabric made for tough working conditions and much more durable than traditional hi vis jacket fabrics. This jacket has superb abrasion and tear resistance. The Polyurethane (PU) coating on the inside makes the fabric durable, breathable and waterproof. The outer has a water and stain repellent coating that helps keep the garment clean.