Inov8 have produced a top piece of kit in the Thermoshell Pro FZ. Very stylish, really comfortable and warm. The design of this jacket sets it apart from the usual synthetic insulation pieces.
Inov8 says:
Welcome to the future of insulated jackets for mountain runners. Light, stretchy and wet weather protected, the Thermoshell Pro compresses small and packs away into it's own pocket, making it perfect for two-day mountain races, when weight and bag space - as well as overnight warmth - are crucial.
Inov8's Thermoshell Pro FZ Synthetic Insulated Jacket is a great jacket for pre- and post race warmth or all-day wear. It is instantly warm and has a nice cut that (is probably on the slimmer/athletic fit) keeps in warmth and is able to move with you when you are more active. It's not the lightest synthetic jacket but it is warm, stylish and has enough features to make me forget about the weight.
The ThermoPlume insultation does a really good job keeping you warm and unlike down you don't have to worry about it still working if it gets wet. The micro baffles up the sides and stretch panels under the arms increase breathability and stop you from overheating too easily. The cuffs are a bit like marmite but I loved them with the elasticated part set back up the sleeve to give you added protection from the elements.