Thin Base Layer

[This review was collected as part of a promotion.] I ordered this for my son who had outgrown his favorite long sleeve mountain biking shirt. Only when it arrived did I realize it was more of a thin base layer. It’s fine as that goes, but that wasn’t what I’d expected. We kept it since it didn’t seem worth the shipping cost to send it back, but I would not have ordered it had I known better what it was; so the website description could have been better.