This stylish beanie is a simple way to protect yourself from 99% of harmful EMF / EMR radiation. Please enjoy our blog post with additional information, "Hat Trick". It is made from high-quality materials and comes in a dark heathered grey and black. The outer shell is crafted from 100% cotton, and the inner layer consists of 42% Silverfiber, 53% cotton, and 5% Polyester. The beanie is stretchy and will fit most head sizes. The beanie's actual circumference measures 60cm (24") while the depth measures 29 cm (11"). Since the materials contain antimicrobial silver, this beanie is both breathable and resistant to odour and bacteria. This EMF shielding beanie protects you from: Fifth Generation Wireless (RF Radiation), Cellular Radiation (RF Radiation), WiFi Radiation (RF Radiation) and Bluetooth Radiation (RF Radiation). *Hand wash only in cold water, do not wring out, hang to dry, do not bleach.