U-mask SOS basic model
U-mask SOS has inbuilt stapled rubber head bands and can be worn without cover. Just as the REFIL model , it is formed by layers of TNT fabric wit a printed U-mask logo. A low cost, yet equally efficient, U-mask version in a trendy dark purple color. Sold in packs of 1 piece. Lasts 1 year after the package is opened of until comfortably clean.