The Matrix UV Long Sleeve T-Shirt is designed to be worn as a base layer, with long sleeves that help protect the arms from sun exposure. The light grey fabric reflects heat, and the shirt is made from a lightweight and breathable 90% polyester and 10% elastane blend. Mesh under-arm vent panels increase airflow for added comfort in warm conditions. - UPF40+ rated fabric - Light weight and breathable fabric - Mesh under arm vent panels for increased airflow - Light grey fabric to reflect heat - Available in sizes S to XXXL - 90% Polyester 10% Elastane