KleenGuard* chemical chemical chemical A20 breathable particle protection lab coats are designed to move with you and your employees, while helping protect against hazardous and non-hazardous dust. These protective garments offer superior particle holdout coupled with unmatched comfort attributes. The A20 fabric is comprised of five-layers of stacked barrier protection (SMMMS) against hazardous particles. They are a popular choice for dusty environments such as laboratories and remediation, as well as pesticide applications and as decontamination modesty garments.