The DefenderShield® EMF Radiation Protection Beanie Cap offers comfortable and stylish Electromagnetic Field (EMF) radiation protection for your head. Made with a lightweight blend of cotton and nylon and lined with EMF shielding silver fabric, the DefenderShield EMF Protection Beanie can be worn day or night, in both cold and temperate climates to help shield yourself or your baby from ambient EMF emissions in the environment or EMF radiation emitting from your devices. For other EMF hat options, take a look at our EMF Protection Baseball Cap, and our EMF Winter Beanie made with a thicker knit yarn material! Perfect For: travel, on-the-go, school, work, entertainment, dense EMF environments. All Features: Advanced shielding blocks 99% of wireless Radio Frequency (RF) EMF radiation and 5th Generation radiation (300 Hz-10 GHz). Comfortable, lightweight, and stretchy. Made with cotton, nylon, and EMF shielding silver fabric. Fold to get a perfect fit.