Tremendous hoody. I've used it for running in cool temps. Fit is trim, as it should be for a base/sole layer. Arc's update to the Phase material does make it feel better against the skin, although the previous version would only bother me for about 4 seconds before I forgot about it. The hoody is warm but breathable. It's long enough to keep the chill off your mid-section. Sleeves are ample in length without being ridiculously long. Wouldn't have minded thumbholes, but they're not a must. The neck construction is very nice--material drapes to keep the chill off, but doesn't feel constricting.