Feels and fits like your favorite BUFF product. Designed with a 3-layer BUFF replaceable filter that blocks with 98% filtration efficiency, staying put in a built-in treated mesh pocket, and changes out easily. Ergonomically designed with 95% recycled REPREVE performance fabric and a 4-Way ULTRA STRETCH fit easily covers your nose and mouth without feeling claustrophobic or clammy. Simply pull it up and down as needed, no rearranging required.