RZ MASK (&nbsp;82804) F1-Filter Scentless Face Mask Filter with Active Carbon, Gray, Regular - Pack of 3 Neoprene Construction . Tough-duty durability 99.9% Replaceable Active Carbon Filters In hunting, scent control is important. An often overlooked contributor to the scent we put off is our breath In fact, our breath makes up a large percentage of our overall scent This filter uses active carbon technology while exhale to adsorb the particulates that make up the scent of our breath. Pair this filter with one of our Mossy Oak Masks for a comfortable and effective scentless hunting mask This filter is interchangeable with all RZ Mask models Size: Regular/Large 125 to 215 lbs