I know this thread is getting old, but have to reply. I hunkered down and bought some LD base layers for a 7 day trip I was doing. I also bought a set of "First Gear" layers that were on sale. We encountered everything from cool weather with rain to hot and humid in Tennessee. The first gear layers were "ok". They are thin and generally just a basic base layer. The LD Comfort layers are thicker due to the 2 ply construction and when putting them on, feel like they will be too warm. When riding I forgot about them, super comfortable. You must follow the website directions when using them just like everybody says. Will you get hot? Yes, I became warm, but wasn't really uncomfortable. I would soak the top layer a bit when we stopped for gas. Then once we started riding would feel the cooling effect which was really nice. The "First Gear" layers didn't work as well. I would wet them down, but they would dry out really fast. At the end of each day I would wash whichever layer I was wearing. The LD layers took a long time to dry. We stayed in hotels for the trip, so I would would wash and hang them to dry and by morning they were still wet. I ended up strapping them to the bike with a bungee so they would dry. The first gear layers dryed faster, but were still damp. Ultimately, I found myself always wanting to wear the LD Comfort layers. I will order up some extra LD layers and keep the first gear layers for back up.