Very comfortable radiofrequency shielding for the head and thyroid region. Medical grade, silver coated stretchy fabric provides very good microwave shielding. Hand washable using the instructions at the bottom of the page and very soft. Can be worn many ways: covering nose/mouth or not. Covering neck or not. Size of eye opening can be adjusted to your preference. Shielding performance decreases over time. Lightweight, stretchy, anti-bacterial rf shielding fabric is the key. One size fits all. Made in USA.