UPF stands for Ultraviolet Protection Factor.

It is a rating system used to measure the effectiveness of fabrics in protecting against ultraviolet (UV) radiation from the sun. Similar to SPF (Sun Protection Factor) in sunscreen, UPF indicates how much of the sun's UV rays can penetrate the fabric and reach the skin.

UPF ratings typically range from 15 to 50+, with higher numbers indicating greater protection. For example, a fabric with a UPF rating of 50 allows only 1/50th (or 2%) of UV radiation to pass through, blocking 98% of UV rays.

UPF ratings are determined based on various factors, including the type of fabric, its construction, color, and any additional UV-absorbing treatments applied during manufacturing. Fabrics with tighter weaves, darker colors, and thicker materials generally offer higher UPF ratings and better protection against UV radiation.

When searching for high sun protection properties, the higher the number. the better. When searching and purchasing sun protection clothing, the provider should always have stated "3rd party certification," so you know your clothing has the features marketed. 

Clothing and accessories labeled with UPF ratings provide consumers with valuable information about their level of sun protection, helping them make informed choices to protect their skin from sun damage.   

This web site is provided for educational and informational purposes only and does not constitute providing medical advice or professional services. The information provided should not be used for diagnosing or treating a health problem or disease, and those seeking personal medical advice should consult with a licensed physician. Always seek the advice of your doctor or other qualified health provider regarding a medical condition.