The Benchmark GMP SMMS Frock is made from a unique non-woven 4-layer material. It is comprised of two outer layers of spun bound polypropylene and two inner layers of meltblown polypropylene. This combination gives the fabric a high tensile strength and provides a good layer barrier. These frocks also are an excellent water-based fluid barrier and are resistant to light chemical splash, while being extremely comfortable and breathable.