UPF-Ultraviolet Protection Factor- Rating
UPF (Ultraviolet Protection Factor) is a rating system used for garments, hats included. It shows how effectively your clothing is protecting you from ultraviolet A and B rays.
|UPF RATING||PROTECTION RATING||% OF UV RADIATION BLOCKED|
|50, 50+||Excellent||97.5% or more|
In general better protection is provided by:
- Dense fabrics (tightly knit/weaved)
- Thicker fabrics
- Darker colors generally provide better protection due to higher concentration of dyes that disrupt UV rays. The color in itself does not provide any protection.
- Laundry additives, such as optical brightening agent (OBA) in detergent can boost UV protection.
- Polyester and nylon disrupt UV rays well: Wool and silk. Moderately: Natural fibers, such as cotton, rate low, unless otherwise treated
- Wet, faded and stretched fabric could lose it's UPF rating by upto 50%
For garments to be labeled as "sun-protective" a minimum of UPF15 rating is required.
SKIN CANCER FOUNDATION RECOMMENDATION
The Skin Cancer Foundation is an international organization devoted to prevention and treatment of skin cancer. To earn their recommendation for hats, the brim must be at least 3" wide, the fabric must have a UPF30 or higher.
For more information check out the Skin Cancer Foundation's website.