These are light, packable, removable sleeves, low cost.. Perfect. Pay attention to size. I'm 5'11 and 170 lb. I've always worn a medium in pearl izumi jackets. Suddenly, a medium doesn't fit. I bought one of these for my son who always wore a large, and suddenly he needs an XL. Our height and weight didn't change.
Needed a light jacket for early fall riding. Got this on sale from BTD. On receipt was surprised by how the sleeves detach as a single piece vice separately. That's OK for storage, but results in an open back to the vest (covered by mesh fabric) vice a solid fabric back, which would have resulted in a cleaner overall appearance.