Grin Health Mask -N Series is equipped with total 6 layers filter, micro particulate layer and activated carbon layer Advanced one way exhale valvesBreather valve alleviates pressure buildup behind mask. Easy breathing and speaking.Suitable for unisex adults (both men and women) wearing at household, workspace, outdoor or travelling.Comfort Fit and AdjustablePadded adjustable nose bridge for better and comfort fit, easier breathing and speaking. Convenient over ear straps for easy on and off.- Available with optional 1 or 2 valve in Black and Blue color and in sizes standard fits most ( fits medium, large) and XL fits extra large (75+ Kgs)- Long storage shelf life of 5 years FORMAL AND CASUAL FRIENDLY DESIGN LOOKS GREAT. Good looking mask will stay beautiful longer and multiple/reuse.