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Both eyepieces can be looked through, although not at the same object. Ventilation holes in the respirator allow for easy breathing. Five straps and steel buckles are all adjustable for size. This mask will fit up to a 24” diameter head. This mask fits over eyeglasses.
The mask is put on by placing the bottom over the chin and then pulling the top three straps up and over the head. Lastly the two bottom straps are buckled. Mask may vary slightly from photos.