This jacket sees a lot of winter use, whether it's walking around town on a breezy winter day, or layered under my shell for skiing. And the jacket does it all. It's definitely enough to keep me warm on a windy 30 degree day and the stretchy side panels allow some extra mobility when you decide to be a bit more active in it.
They're not kidding when they say trim fit either, beer bellies need not apply...

I bought this jacket to keep me warm at the Anzac day dawn service in Turkey in April. The pre dawn temperature dropped to around 4 degrees c and the wind blew most of the night. The R4 kept me warm all night. I recommend this jacket to anybody who may encounter similar conditions.

I am a loyal fan of the original R4, but could never take advantage of wearing it in layers. I bought the R4 Light (black) to take on deployments to Iraq and to wear under my digital uniform during the cold, wet Iraqi winters. It fit beautifully, unzipped fully when needed and even when washed under military conditions, came out softer and even better than the first wearing. For warmth without the bulk - this is a real find!

I wore my buddy's similar North Face jacket before buying this and found it comfortable, warm, and windproof. But after receiving mine and comparing the two, this Patagonia is by far superior. It's lighter, warmer, and a big reason in why I bought mine is that you don't see a dozen of them in a day like the North Face. Forget what reviews say about the jackets running large - I downsized to a medium and the jacket was too small. I'm 6'1" 170 and needed to send it back for a large that now fits awesome. Strongly recommended and buy with confidence from this site!

The R4 is my go to jacket, not to hot, not too cold. The wind doesn't get to your core, its not too bulky, its simple and stylish. I am very pleased with this jacket, if you are thinking about one, you will be stoked if you get one!

I bought one of these 3 years ago to run double duty, under a ski shell in the winter and with waders in the fall. This thing works perfect for both. Under a shell this is perfect insulation for weather anywhere from 0-35 F. As mentioned sizing is a little on the small size. I'm 6'2" 210 pnds and the L is a little short not extremely snug, but not baggy. I preferred this fit for under the shell. quality is top notch as expected from patagonia. the R1 grid material on the inside makes this jacket extremely comfortable.

this is the perfect mid-weight jacket for all occasions. no other layers needed until you go under 40 degrees.