The Catago UV top which is made of a very light and mositure-wicking fabric with a mesh part under the arms, which makes top very breathable. Nice details in front with a zipper at the neck. Recommended as a base layer under a jacket during the winter, or as a light shirt during the summer. The fabric has UV protection. UPF 50+ rating. It blocks more than 98% of UVA and UVB rays.