This baseball cap is a simple way to protect yourself from 99% of harmful EMF / EMR radiation. Please enjoy our blog post with additional information, "Hat Trick".The caps are made from high-quality materials; the outer shell is composed of 30% wool and 70% cotton, and the inner layer features 35% Silverfiber and 65% Organic Cotton. There is an adjustable velcro back closure to accommodate a perfect fit. The silver fibre offers RF/microwave shielding performance with a shielding effectiveness of up to 85 dB from 10 MHz to 18 GHz and beyond. The antimicrobial silver material inside is breathable and resistant to odour and bacteria. This EMF shielding baseball cap protects you from Fifth-Generation Wireless (RF Radiation), Cellular Radiation (RF Radiation), WiFi Radiation (RF Radiation), and Bluetooth Radiation (RF Radiation), and it also blocks UV Light. *Hand wash only, do not bleach.