Light, soft but structure fabric stays off your mouth and wicks sweat but still allows air to flow through. The fit is secure but not tight, with a soft, adjustable nose bridge, and a strip of baselayer fabric for a snug fit under glasses. The inside fabric uses UA Iso-Chill technology next to skin to disperse heat, so it actually feels cool when you put it on. It is fully washable, durable, and then ready to wear over and over - making it more environmentally friendly than disposable masks or filters.