The patented three-layer fabric construction of KLEENGUARD A60 Bloodborne Pathogen & Chemical Splash Protection Coveralls feature a middle layer of microporous film that allows heat and sweat vapor to escape, yet protects against many dry particulates and liquids, even under pressure.  It also passes ASTM F1670/1671 testing for penetrations of blood, body fluids and blood-borne pathogens. And the thicker, more uniform outer layers provide even better protection of the film barrier against tearing and abrasion.  This results in the ultimate combination of durability, comfort and protection.