Pleated filter technology reduces breathing resistance by up to 50%. Washable face seal wipe clean leaving the mask hygienic. Strap and clip easy application. Hung around the neck between use. DuraMesh« shape retention durability. ActivForm« adjusts to different face shapes. Ventex«-valve reduces moisture and heat within the mask. FFP3 20 x WEL. Areas of use; Fine Toxic dusts, fumes and water-based mists/aerosols. Box of 5.