Long sleeve gradient rainbow shirt

Rainbow-like gradient, long sleeve shirt. I love the way this looks, but, TBH, I failed to read that materials when I bought it and thought it would be like a light sweatshirt, instead, it’s the consistency of an athletic/race shirt with a sheen-like appearance. Very comfy, but I just moved to the South and I don’t like the feel of the material mixed with the constant humidity. Make me an offer!!! Size M Listed as 65% cotton and 35% polyester, but *feels more like 100% polyester*