Fire zero by Wolverine flame resistant garments are engineered to offer you the protection needed while still providing the comfort, quality and durability you have grown to expect from Wolverine. Our products are completely FR, double dipped in an FR treatment to ensure all materials are properly coated for your safety, minimal shrinkage limited to 3 percent or less, low formaldehyde using up to 75 percent less than our competitors while still maintaining certified protection from heat and arc flash hazards, and we use a type of nylon engineered with heavier yarns to provide a stronger fabric.