Buff Filter Tube Apex-X in Black The new Buff Filter Tube Apex-X is reusable and features a 3-layer replaceable filter system in a washable multifunctional tubular made from recycled microfiber. Ergonomic neckwear design to be comfortable all day. Certified filters provide 98% bacterial filtration efficiency meeting the performance requirements of Bacterial Filtration Efficiency and Breathability of the harmonized European standard EN 14683:2019 for surgical masks.Features   All-day comfort - lightweight, breathable with an ergonomic design. HeiQ V-Block - antimicrobial fabric treatment applied to inside pocket. Comes with 5 replacement filters. Non-reusable, can last up to 24 hours.