I usually wear large in things, but....
170 lbs (should be closer to 160 by ski season - was 194 last season.)
In the nano puff jacket would a M or L be better? Will be buying on pro deal so can't return it.
I'm a few inches taller but about the same weight as you. I have (had) the Patagonia down sweater in a medium. With a base layer and a thin fleece underneath it, it was pretty snug. Not uncomfortably so, but yeah -- it was snug. I have since exchanged it for a large which I like more.
You're basically right in between sizes... i.e., mediums will be snug, but it'll work. Large will give you some more layering options.
I've found that Patagonia runs pretty big and boxy. DH is 6'1" and 195, longer in the arms and torso, and often wears an XL -- but swims in the Pat XL. Unless you are layering a lot underneath, I would get the M, especially if you are losing a bit more weight. (If the nano fits differently than than the down sweater, disregard this advice. :-) I think they are similar, though.)
I see Seg posted while I was typing. I think we concur on this one.
CONGRATS! my adivce? order both and return one (unless you are ordering on Pro-form of course) My gut feel (pun intended) is go with the medium if you don't intend to wear more than a super thin base and maybe a R-1, if you are wearing anything that will be fleece-based go large. The large will be a little baggy around the mid section so its def' one of those fit preferences things.
Congrats on the weight loss and conditioning!
I don't know Patagonia specifically, but as to jacket-vs-pullover, I always go jacket. If you get too warm, it's nice and easy just to unzip the whole thing. Also, taking it off is mildly easier over a helmet, or if you're wearing a seatbelt.
Me- 5'9" 175 lb, 40R jacket, 15.5/34 shirt. Size M Nanopuff pullover is perfect, close enough fit to use as mid-layer but loose enough to wear as a casual outer layer. I also have a REI Revelcloud (Nanapuff clone, also size M) but in the jacket, personally I like the jacket design best. I use the jacket all the time- quick trip to the store on a cold day, walking the dog, attending an outdoor sports event, traveling, etc. The handwarmer pockets and full zip put the jacket over the top. The pullover Nanopuff is relegated to mid-layer duty for skiing since it's slightly less bulky. Both are functional but for different reasons. Either way you can't go wrong, these are great pieces, some of the best outdoor clothing items I've ever owned.
I'd say that's accurate in sizing. I tend to wear a Medium but have the nano puff in Small and it fits well.
I have several nano puffs in different colors and really like it for a midlayer on days when I'm fearful that I'll overheat.
The Down sweater is warmer but all of these pieces have a purpose and the nano puff fits well into any skiers line up. Enjoy!
I have been really pleased with Patagnoia. Not surprised that they're working with you on it.
For those that don't get Patagucci bro deals the MontBell Ultralight Down Jacket is a great alternative and less expensive. I have the MontBell Alpine Light (a bit more puffy) for cold weather backpacking and it is a great high quality product.
Patagonia is a great company to deal with. Not surprised that they handled it this way