I absolutely love my Sport Hoodie! In fact, I own two - one in the rose color and one in white. The attention to detail, style, and fit is beyond what I'm used to in athleisurewear. Living in Los Angeles, I am constantly on the lookout for SPF-wear, as I like to walk and go on hikes. But, with the weather being warmer here, I often end up peeling off my sun protective layers. I don't have to do that with Soleil! I don't know what the fabric is made out of but it's light, feels silky, yet still feels substantial. Plus, the airvent paneling along the sides and under the arms are great for days when I get sweaty. I purchase a lot from Lululemon, Athleta, Sweaty Betty, Lorna Jane, and this hoodie is by far my favorite!