The Xtreme Hood is developed to exceed all demands for escape hoods and is highly recommended for concentrations above 1000 ppm (parts per million). The hood’s extremely low leakage, combined with the high class filter, gives significantly longer action time or protection for higher concentrations of dangerous substances. The hood is made of a high visibility material. The visibility is furthermore enhanced by reflective stripes. The seal around the neck is made of a special silicone which gives a very effective seal, but the hood is yet comfortable to wear. Extremely low leakage. Test average in breathing zone is 0.06%, where 5% is the limit.