Kleenguard 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.