Don’t just take our word for it. Every coLLo shirt was carefully analyzed for its sun protection capabilities by SGS-CSTC Standards Technical Services Co. Ltd., one of the world’s most respected independent testing labs. SGS is a world leader in measuring the Ultraviolet Protection Factor capabilities, and strictly follows the AATTCC 193-2014 testing protocols for both dry as well as wet and stretched fabrics against UV radiation. After rigorous tests of the fabrics used in coLLo shirts, SGS awarded coLLo with a UPF 50+ designation (Excellent), the highest level of protection for the blocking of UV-A and UV-B burning rays.Using a UV – Vis Spectrophotometer model, SGS Testing Service performed multiple tests of both dry and wet (and stretched) fabrics used by coLLo for our golf shirts. They washed our shirts multiple times and exposed the fabric to intense UV radiation to simulate the impact of fading and fabric degradation from long-term sunlight, stretching, and repeated washing. SGS Testing Service strictly follows the following industry standards:American Association of Textile Chemists and Colorists (AATCC) Test Method 183 specifies the protocol for conducting a UV transmittance test;American Society for Testing and Materials (ASTM) D 6544 describes the methods used for evaluation of a fabric’s life cycle UV protection;American Society for Testing and Materials D 6603 provides guidelines for labeling sun protective clothing.In addition, coLLo worked closely with leading fabric suppliers to search for unique athletic fabrics that combine UPF 50+ sun protection, efficient wicking and coolness, along with four-way stretch capabilities for maximum performance and comfort.We would be happy to share a copy of the SGS testing results by request.