This jacket works very well with or without another jacket on top. The material is very rugged, yet soft, and fits well over other clothing. The Firestorm jacket fits very well over this jacket and the two go "hand in hand."

I love the thinness of this garment. It is a great lightweight jacket or a great base layer for going to outside events. Also enjoy this color rather than a black or brown basic color.

Very impressed with the Reactive full-zip jacket. At first I wasn’t sure that such a thin jacket (that was more like a sweater) could possibly be warm. Happily, I was wrong. As a base layer, it is outstanding. No overheating and no hot or cold spots.

I've been using this over an Akkomplice™ Crew base layer for winter hiking in NH. It works well as active insulation. If you're not moving it does not seem to provide much warmth without adding additional layers. I ordered a size L and it fits me well.

The grey sets off the green well. We'll sized and nice material. Typical Kuhl quality. Surprised? I'm not.

The Reactive Full Zip is great. Comfort and really warm for the weight of the jacket. Fit is good for me and I like the thumb hole that allows it to cover part of the hands.

The quality and comfort and fit of their clothing is the best i've found. They have something for every season. This light jacket is perfect slightly cooler days and works great a base layer on other days. I would recommend.

Husband says it is very warm and comfortable. It’s thinner than I was expecting but he says it is great and looks forward to wearing it this winter as a layer

Lightweight, warm & comfortable. Works as advertised. Warms you up quickly but not too hot. Good for layering--not bulky at all. Stylish look. The ability to make the zipper go all the way up and associated flap over zipper to protect neck does make collar lay a little weird when not zipped all the way. Glad Kuhl finally made a jacket this wei...

Warm, light and easy to maintain! Wonderful for wear in all temperatures, Base layer and above! Must have!