It's well known that your arms contain lots of veins and a couple of decent sized arteries. Bearing that in mind, an excellent way of controlling your body temperature is to expose or cover your arms as you cycle, to cool or warm up your blood and thus to control your overall body temperature (especially your core temperature.)
Adidas has taken advantage of this principle in this versatile jacket by incorporating zipped vents in the forearms to allow cooling as and when you need it.
The front of the jacket is waterproof and windproof and warm. The shoulders and the rear of the arms have Climawarm material (to allow heat out more easily) and the back of the jacket is made from a thinner section of material with a neat Climaproof section that forms the pocket making a mini splash guard section with reflective piping all around it for visibility at night.
The three Adidas stripes at the side of the waist section are also reflective, and the whole jacket is very well made. With just a simple base layer underneath this is a wonderful bit of kit that keeps you warm, dry and yet allows you to control your temperature without resorting to opening the front of the jacket.
Top marks for design and materials, and the price is attractive too.