Buff Filter Ape-X Adjustable Face Mask in Black | One Size The new Buff Filter Ape-X Face Mask has become an essential accessory for daily activities like grocery shopping, using public transport or going for a run. The BUFF® Filter Mask features a 3-layer, replaceable filter system in a washable mask design made from CoolNet® fabric. Reliable and comfortable, featuring 98% bacterial filtration efficiency. Filters meet surgical mask standards. Features  Adjustable fit - Back of head/neck adjustable straps for a perfect fit. All-day comfort - lightweight, breathable, ergonomic design avoiding ear pressure. HeiQ V-Block - antimicrobial fabric treatment applied to inside pocket Comes with 5 replacement filters - non-reusable, can last up to 24 hours