ABOUT SIZEThe elastic band design allows this visor hat to clip on your head easily, staying in place during most activities you are doing. One Size Fits Most Adults.^ The sun hat will reflect ultraviolet rays, and it will have a variety of coloraixinful effects under different light.^BETTER MATERIALS PVC material can filter ultraviolet A & B, and other harmful ultraviolet rays from the sun. The hat won't stop or reduce too much visible-light into your eyes.^WEARING PERCEPTION Comfortable fit, stylish look, retro appearance, light weight, adjustable design.^APPLICABLE SCENE Non-glare undervisor for better vision while running, beach, camping, traveling, riding, fishing, jogging, hiking, mountain climbing, golf and other outdoor activities.