I'm a fan of sunsleeves too. I ride directly into the sun both ways on my commute and noticed that my left wrist above my watch band is by far the darkest patch on my arms even with sunscreen. I'm going to start wearing the sleeve under my watch, pulling it as far down toward my hands as possible. It's still in the 60s or lower here, so don't know if they'll get uncomfortably warm, but I'm not concerned because we don't get much beyond the mid 70s most of the summer.