Certified to NFPA 1990, 2022 Edition for chemical and hazmat cleanup, emergency response, and domestic preparedness. Made of special polymer material, this comfortable boot meets the protective footwear chemical permeation requirements of NFPA 1990, Standard for Protective Ensembles for Hazardous Materials and CBRN Operations. The HazProof® boot has also been tested to Military Standard 282 and will provide protection against certain chemical warfare blister and nerve agents.