Material: cowhide + sponge + glass. The mask is made of high-quality materials and sponge frame, which is durable, sweat-wicking, heat-resistant, breathable and very comfortable to wear. Features: It can effectively prevent skin flap and sweat slag, dust and other foreign matter from entering the neck and face. The flip-up lens eliminates the need to frequently check the solder joint positions, making the soldering work more convenient and safer. The mask has a velcro fastener on the back for easy, quick and easy adjustment and size adjustment. The ideal accessory for complete protection for welders. Helmet height: 32.5 cm / 12.79 Helmet thickness: approx. 1.4 mm / 0.55 Head circumference: approx. Lens dimensions 60 cm / 23.62 (LxW): approx. 10.8 x 4.5 cm / 4.25 x 1.77. Note: All dimensions are measured by hand, please allow minor deviation. Due to different monitors, the color of the actual item may vary slightly from the pictures shown online. Thanks for your understanding. The mask