Alpha Pro Tech Critical Cover PFL hypoallergenic earloops facemask with Magic Arch supports and Twist-Seal. The innovative and patented Positive Facial Lock (PFL) feature utilizes our exclusive Twist-Seal technology that allows the user to create a custom fit each and everytime. This unique feature significantly reduces the possibility of the user inhaling airborne contaminants and creates a positive seal to a variety of facial sizes and features. Additionally, the integrated Magic Arch prevents the mask from coming in contact with the user’s nose and mouth thereby making it easier to breathe while enhancing filtration efficiency. The hypoallergenic materials used in the PFL masks create a durable exterior and a soft, comfortable interior.