The Catalyst is almost exactly the same as the original DriClime shirt from Marmot. It's got a fancy reflective graphic around the chest pocket, and side pockets that zip. Other than that, I can't tell any other differences. I have loved my original DriClime shirt for years, and this has been a welcome addition to the family. As another reviewer put it, the Catalyst is more of a full function jacket than the original is. At the sale price right now, worth picking up regardless!

Just as dependable as the regular Dri-Clime jacket---It's the one pc of gear that's in my pack all the time

I own an older version of this jacket and love it. I like the zippered pockets of the new version, but the pockets are unlined and you also lose the neck draw cord (which can be nice to have in really windy conditions). My biggest issue, however, is the stretch panels are not very windproof and allowed a lot wind to penetrate and heat to escape. Some users may prefer this for high aerobic heat venting, but the decrease in wind protection caused me to return this jacket.

I used most of the reviews to gauge the size I needed, but ended up ordering the first one too big. If you are a MED in other jackets I'd say you're a MED in this one too. Got a Large, exchanged for MED and have been very pleased with it. Warm and comfortable with 1-2 layers underneath down to mid 20's F temps.

I absolutely love this jacket. Light, comfortable and versatile. Like the pockets. Ingenious draw cord inside the pockets to tighten jacket around the waist. medium size fit was perfect.

I got ROM and Ramble shirt in M and both fit just loose enough for comfort.
This jacket, however, is as tight as it gets in the same size. Zipped up, it feels pretty restrictive to the point I have to pull the sleeves up myself for fear of tearing the back seams apart should I swing my arms forward a little too energetically. Stretch panels dont seem big or stretchy enough to allow complete freedom of movement and it rides up a hand or two's breadth when I raise my arms (angel wing movement my ass ;)
Apart from that, it looks more than adequate for wind protection but I haven't taken it out yet (and won't until spring as it's too cold now). Probably good enough to run around in.

This jacket is awesome. Its reasonably light and comfortable to wear. It stops the wind (tested it High on a Colorado 14er) and helps keep warmth in. The driclime is quite comfortable and soft enough even on bare skin but the jacket is still easy to put on and take off. The only downside is that the pockets are unlined and that the jacket is a touch shiny and and not super quiet but its pleasant to wear. The exterior material sheds water and even if it gets a bit wet it dries so fast that its amazing, same with the driclime interior lining. The jacket has mesh lining around the armpits area inside for ventilation and a different material on the exterior in the same area. It looks good and overall the jacket breathes well. Great for mid to high activity.

This jacket is a very versatile piece of gear. Its great by itself, over a baselayer or over a fleece midlayer. If you hike in windy weather and dont want to wear a hardshell all the time you need this.