Very warm. If worn under a rainproof jacket, it's probably *too* warm for most activities in the UK, apart from relaxing by the campfire in the evening. Perfect for winter travel, though, or keep it in your rucsac in case of emergency. I like the cut, and it looks as stylish as you could expect from such a utilitarian kind of garment. The fabric is still quite breathable, and wicks well despite being so warm. The pockets are practical too - the zipped chest pocket is practical for phone & keys, the handwarmer pockets are comfortable, and there are also two baggy inner pockets big enough for an OS map or a snack if you're into that kind of thing.