Otso Black MaskMasks are a necessary and mandatory complement for anyone, both when working and during their free time, and of course practicing their favorite sport. Otso Black MaskMasks are a necessary and mandatory complement for anyone, both when working and during their free time, and of course practicing their favorite sport.Characteristics:● Made entirely in the European Union● OTSO masks are reusable , can and must be washed according to the instructions on the inside label, and do not have an expiration date. It is highly recommended to wash them also before their first use.● They have three layers :

• • The first, the one that is in contact with the skin, is made of cotton, spongy on the inside to avoid irritations, and with a great capacity to filter bacteria and microbes.
  • The second is made of polypropylene, the fabric most used today for the manufacture of masks, with a specific micro-filtration structure and a “water repellent” membrane system.
  • And the third is polyester for high quality sublimation.