I wore this to the barn right after receiving it in late April and it was just perfect. Long sleeves felt great in low 60 deg weather, but was breathable & fine for riding in the sun in a late afternoon mid 70 deg warmup. I love this top, want more in fun colors!
I live in Arizona, and the Kastel Denmark sun shirts are the best for staying cool during the summer (and fall and spring, which are also hot!). Not only do they work the best, they are the most stylish and very durable. Well worth the money!