Jacket is warm in 40 degree weather, with a t-shirt and lightweight fleece. Rode in light rain today, stayed dry. Have the hi-vis version, and I feel alot more visible. Blocks wind really well. My only complaint is the fleece vest. It has nothing to hold the bottom down so it bunches up around my back and arms when I put the jacket on. I just removed it, problem solved. Like I said, still warm at 40 degrees. Not warm enough for mesh jacket yet, but had the alter ego jacket, loved the mesh option for summer. I wear a large shirt etc, got jacket in large, fits great.