The Mission Darkness™ EMF Blackout Hat is a comfortable shielded baseball style cap perfect for everyday wear. It’s lined with a discreet layer of TitanRF™ Flex Faraday Fabric, an electromagnetic frequency (EMF) shielding material that has been lab certified to confirm shielding effectiveness standards IEEE 299-2006 (see report below). This material provides a barrier between your head and harmful electromagnetic radiation (EMR) and radio frequencies (RF) coming from mobile devices, cell phone towers, smart meters, and other outside sources. The hat is breathable, flexible, and uses an adjustable snapback closure that fits most head sizes from 21.5″ to 23.6″ (55cm to 60cm) circumference. Wear during travel, while on the phone, at a workstation, or any location where you want to reduce your exposure to EMF.