Dual one-way discharge valves traps and filters air molecules and make air resistance smaller without sacrificing filtration.
An adjustable nasal type clip helps ensures a 360-degree seal and avoids lens fogging. So that can prevent dust going through and helps you to breathe smoothly, you don't need to worry that fogging up your glasses.
Elastic Soft ear loop design ensures an effective seal from the outside air. Adjustable hook & loop strap gets the perfect fit. Easy on, easy off.