The Skin Cancer Foundation considers clothing to be the most safe and effective defense in the fight against skin cancer and aging.
UV Protection Factor or "UPF"
The Ultraviolet Protection Factor (UPF) rating system measures the UV protection provided by fabric. It is very similar to the SPF rating system used for sunscreens.
A garment with a UPF of 50 only allows 1/50th of the UV radiation falling on the surface of the garment to pass through it. In other words, it blocks 49/50ths or 98% of the UV radiation.
All sun protection shirts on this site have a rating of UPF 50+, which is the highest possible rating
and are recommended by the Skin Cancer Foundation
Our fabrics are thoroughly tested at independent labs to ensure each product exceeds our UPF 50+ standard. We test multiple samples from every dye lot of every fabric we use. After conducting an initial UVA/UVB transmittance test, all fabrics are further tested by laundering samples, then conducting a second UV transmittance test. Garment ratings are based on the lower result of the initial "brand new" test and the second "life cycle" test. Most summer clothing exposes large amounts of skin to the sun. A major goal for UV protective clothing and UV protective swimwear designs is to cover as much skin as possible while still making the garment cool and comfortable to wear. Our shirts have specialized moisture managing UPF 50+ rated fabrics to achieve these dual goals of comfort and maximum skin coverage.
Scientific Review Article supporting Sun Protective Clothing in the Prevention of Skin Cancer
Here is an excellent and authoritative journal article about sun protective clothing. It was written by some of the recognized authorities in sun protection including plastic surgeons, an ophthalmologist, an otolaryngologist and head and neck surgeon, trauma surgeons, and a leader in health education. The article discusses sun protection and the role of sun protective clothing products