3 PLY MASK, It means it will provide you three layer of protection, 1st layer – non woven fabric blocking droplets. 2nd layer-?melt blown fabric to block and absorb particles. 3rd layer- non woven fabric for moisture absorption. Ideal for procedure where light to moderate amount of fluid, spray and aerosols are produced. It means blossom 3 ply earloop face mask is non allergic. As such,safe for use on skin. People allergic to latex are strictly advised to stay away from latex resistance bands. Feel soft on your skin. Bridge clip will provide better air tightness.