Items that can easily shielding electromagnetic waves for those who have a lot of outdoor activities! Introducing shieldgreen electromagnetic shield cap. Special fibers to cut the electromagnetic wave into the lining of the silver microfiber! ShieldGreen uses eco-friendly materials without heavy metals, silver-nano, metal plating! Everybody knows! The color of the cap is black, beige and gray. The form of baseball cap, the front part of the face also blocks sunlight and electromagnetic waves widely. ShieldGreen Electromagnetic Shielding Cap for Everyone~! Black and beige cap are made of Silveric(silver microfiber). Gray cap is made of Staric(stainless steel yarn). You can adjust the size of the cap behind the buckle.(Free size) Cap packaging pictures