Torred Apex Jacket
Definitely one of the best lightweight, synthetic mid-layers that I've owned. I constantly use it in pair with other mid-layers and a hard shell on top of it. I live in the White Mountains of New Hampshire, and have used it in a wide variety of conditions. When wet, it still retains its warmth value. In extreme cold (I've used mine, paired with other layers, of course) down to -40F and its held its own. If you are looking for a minimalist jacket without tons of frills, this will do you well. Fits true to size. Outside material is durable too.
There is a reason why this jacket receives so many 5 star reviews. I have a medium, hooded 10 inner/outer jacket (orange inside, green outside) and absolutely love it. I am 5'10'' and 165. In a dress shirt I wear 16 1/2 neck and 33 inch sleeves. The medium has plenty of room for layering. I have had it for one month now and have no issues with it keeping me warm or with wind cutting through it. Excellent craftsmanship and very lightweight. I would echo the other reviews that a cinch cord on the bottom (like the one on the hood) would be nice, but definitely not a deal breaker. The elastic cuffs are just fine and I don't think you would need cinch cords for the cuffs like some other reviews have mentioned. Overall a great jacket and would highly recommend it.