Sun Protective Clothing UPF and SPF Rating December 30, 2014 15:23

 UV protection are called UPF (Ultraviolet Protection Factor). UPF is like the sun protective factor SPF used on sunscreen lotion bottles and fabrics today, in that both UPF and SPF measure sunburn protection. One difference between UPF ratings and SPF ratings is that UPF measures both UVB and UVA radiation blocked. SPF is a measurement of UVB radiation only. I have been wearing the UPF50  Cool-Dri performance shirt over the last several years and can confirm how effective of a shirt it is from the sun protection to the incredible durability wash after wash. Whether it's a day on the water fishing, out for a bicycle ride or just simply outside doing yard work I always wear a UPF shirt for protection. Also, consider the UPF fabric rating requires that fabrics claiming to be sun protective must be prepared in the following ways before testing:

  1. Undergo 40 simulated launderings
  2. Be exposed to 100 fading units of simulated sunlight
    (equivalent to 2 years light exposure)
  3. And, if intended for swim wear, exposure to chlorinated water

The following is a comparison between the UPF and SPF ratings:

Classification Category Rating % UV Blocked
Very Good UV Protection UPF 25, 30, 35 96.0% - 97.4%
Very Good UV Protection SPF 25, 30 96.0% - 97.4%
Excellent UV Protection UPF 40, 45, 50+ 97.5% - 98.0%
Excellent UV Protection SPF 30+ 97.5+%