1Using polycarbonate lens, good impact resistance, effective blocking of ultraviolet rays, longer service life. 2There are two vents on the upper and lower sides. Effectively prevent internal fogging and help air circulation inside the glasses. 3Glasses are designed according to people's nose shape, which fits the face and is comfortable to wear. 4Overall material of the glasses is light and convenient, longwearing, no pressure. 5High elasticity retractable headband, length can be adjusted, suitable for various head circumferences.