Desc. Features Specs & Guarantee If you've got a big head these are the glasses for you! These XL Vises feature Blue Light Blocking lenses which help to reduce eye strain caused by LCD/Computer/Smartphone screens. These lenses help to keep your eyes relaxed and physically lower the stress of screentime, especially at night. We took the time-tested design of the Vise and added an extra 10mm in width and jacked up the height to 54mm to provide larger than life comfort and coverage. The XL VISE also meets ANSI Z.87 impact requirements and is compatible with our Vise Side Shields to give you the Z87+ protection for the toughest jobs on the yard. The XL VISE Z87 meets OSHA eyewear specifications for jobs not requiring side shields and chemical splash resistance. Blue Light blocking info: 25% blue blocking revo process, UV400 with a transmission of 84% -Includes Microfiber bag-Matte Black frames & Metal inlay logos -California residents, please read the Proposition 65 warning Disclaimer: Removing arms, lenses and or changing configuration in any way voids Z87 compliance. Z.87 compliant, U6L3 - UV400 - 100% UVA / UVB blocking.Shatter-resistant polycarbonate lenses. Durable polycarbonate frame construction. 100% Satisfaction Guarantee - If you are unhappy with an item for any reason we will gladly accept unworn product in it's original packaging for full refund within 60 days from the date you received it. Warranty: We fully back all of our products against manufacturer's defects. If you have any issues, we will replace any defective or malfunctioning part at no charge. For more information on our warranty policy please visit: Heat Wave Visual Warranty and Returns