From the start, Oakley has been committed to providing professional and everyday athletes around the globe with solutions to support their performance and day-to-day activities. Designed with seal, filtration, fit and eyewear integration in mind, the Oakley MSK3 Mask is designed to work seamlessly with eyewear and fit snugly on the wearers face. ? Medical-grade silicone gasket on the nose area is designed for comfort and excellent fit while providing advanced protection. Designed specifically to avoid fogging, the MSK3 features a semi-rigid mask body adds additional space to lift the mask off your face for superior breathability. An aluminum bar embedded in silicone gasket adjusts for a perfect fit that accommodates your glasses, while the flexible silicone mask fits seamlessly with eyewear. The elasticized straps are adjustable to fit any size. Your MSK3 mask includes two filter options for filtration and breathability. The high-performance, disposable filter has over 95% filtration efficiency of particles down to size of 0.3 microns, while the additional reusable filter is designed for filtration protection against air pollutants and dust particles. Replacement high-performance filters and reusable filters are available for purchase. To care for your reusable mask, simply hand wash it and hang it to dry.