Louis Garneau Enerblock Jacket
This is a very nice jacket, and is suitable with minimal base layers for temperatures around 7 Celsius. You can probably wear it lower than that with a few layers under, and just an undershirt to about 15 Celsius.
I really like the jacket, it has a wind-proof front, and nice ventilation at the back. All the materials are nice and stretchy, but I think the Louis Garneau upper body wear sizes run much too big. I would usually ride a Medium Long Sleeved jacket, but I am wondering if I need a Small or Extra-Small for this item.
That is the only thing stopping this jacket being 5 stars. If it fit better, I would give it 5 stars. If you are going to buy it, it will be 5 stars if you size down one size!