Thermawrap Sizing

I'm about your size ( 5'-6" and 42" chest ) and I have a thermawrap jacket and a u.l. down inner parka both in medium. They are pretty snug, but not too tight. I can fit a light shirt under them and my medium rain shell over them. I think a large would work for you. Hope that helps.

Montbell stuff tends to run small. I usually get medium in most things, but needed to go to a large for my thermawrap jacket. Even my large fits snugly. A medium would have been way too small.

I own a Thermawrap vest in large. My chest is ~42. The Large fits snugly. I can wear it over a t-shirt + Patagoina R1. Anything more and it would start to get restrictive. Also, I'm 5'10" with an 18.25" torso for backpacking sizing purposes, and I find the large to be okay lengthwise, but I wish it was .5" longer. I have no experience with the jacket, but I have a UL Down Inner parka, and the large in that is much more generously cut in the chest area than the thermawrap vest.

I know it sucks to have to spend the money, but it might be worth the $10 or whatever in return shipping to order both and end up with the correct size. I tend to fall right on the medium/large border for most manufacturers tops, and that's what I end up having to do.

If you don't want to do that, I'd say with Montbell, when between sizes (or close), size up.

Hi Aaron,

I'm 6 ft tall, 185 lbs, 42 in. chest and for wearing over a base layer and midlayer, I'd fit a Large Thermawrap Parka (hooded) – it would fit me snuggly but not at all tight – just right. If you wear it the same way you'd be a Medium. That said, I prefer to wear it belay-style over all layers, so I can use over all layers at rest stops in addition to in camp and as part of a sleep system, so I wear an XL only for that reason. I tried on a M, L and XL when I bought.

If you are looking for the Medium, I have one for sale in excellent like-new condition that will save you a good $60-90 over the new one depending on what the price is now. Bought it for my wife, but with us already using a few pieces of outerwear we've bought that are the same color, I picked up a women's Thermawrap for her in a different color. Now we no longer look like members of an adventure racing team (not that that's a bad thing to be identified with).

Posted here a month or two ago but no one in a size Medium was looking at the time. Was going to repost before finally selling on Feebay. PM me if you're interested.

So, if I'm 5'10" with a 44 inch chest, should I get an XL? I had heard Montbell's stuff tends to run small… (I'm looking at the UL Down Parka.)

Thanks for the offer, EJ, but the medium would be too small as in most other brands I need a large.

I ordered the large based on the feedback here and some other sources I looked at. It should be here in a couple of days but I'll just exchange if it is too small.

The large in the vest and jacket arrived today – both are a great fit. I can layer under or over them – absolutely perfect.