Description: High-density polyethylene cap shell, UV protection. Low-density polyethylene liner wear with eight support. Electrical insulation properties, and with a black velvet sweatband, safe and comfortable. Sliding button headband, a pencil holder, convenient and practical. Adjust the wheel headband, one hand to adjust the locking pulley to ensure wear with sliding. The cap shell back with business card holder, with the role of stored items. The back of the cap and the left and right sides have their own non-slip, in the wet and greasy environment or gloves can easily lift. With stomatal type without the hole type to choose from. The cap shell Optional colors: yellow, orange, white, blue, red. Meet the EN-397 standard.