"The use of Coolmax® with a special knitting process, developed by Original Buff®, also yields improved UV protection while maintaining a highly breathable fabric with good elasticity.The UV Buff® fabric has been tested for UPF rating by the Australian Radiation Protection and Nuclear Safety Agency (ARPANSA) in accordance with the standard AS/NZS4399:1996 ""Sun protective clothing- Evaluation and Classification"", and all the UV Buff® collection offers UPF from UPF 20 to UPF 50 depending on the design. The UV Buff® is perfect for any outdoor activity, or to be worn as a casual wear accessory during summer season since it provides cool comfort, dries faster than other fabrics, is highly breathable, and offers good UPF protection."