First of all the fit... I'm 5'8", 180 lbs and the 52/42 fits perfectly. At first I thought it was a little tight across the chest but when I'm in the riding position it fits perfectly. I was looking for a lightweight mesh jacket with decent protection for my daily commute. Even though this is mesh, the armor in the arms has a great, close fit from the elbow down the forearm. The shoulder armor fits good as well. The material might burn through on a get off, but the armor seems like it will hold up. There's always a trade of between air flow and protection. This is definitely a great flowing jacket, almost like wearing a tshirt. The styling is great and the quality is top notch.