I'm 5'8" 150 and the small fits me perfectly. It's really nice and soft, yet has some heft to it. I was a bit concerned about the 190 weight merino - I have some bodyfit 200 weight tops I use for skiing, but this does great in warm weather (I wore it in the 80s and was totally comfortable). Most Icebreaker stuff is great quality - this is really good and at the top of their line. It's perfect for business casual work or just wearing around when you have to look a little nicer than a t-shirt.

Super lightweight, stretch material. They've held up through one summer of use (although I wasn't that demanding on them). They do really well in hot weather.

This is a great vest. I bought it as an extra layer to keep in my pack while skiing. It compresses down well into its own pocket. High quality construction; it looks like it'll stand up to some use. Super light but also quite possibly the warmest thing I've ever worn - I can only imagine how warm the full jacket is.

I bought a small and it fits well at 5'8" 150, although it's a bit snug around the waist. If you have more than 2 heavy layers on underneath it might not fit. I'd buy it all over again in a heartbeat.

Fantastic bag - bomber, bomber waterproof construction - the medium is the perfect ski trip carry-on. You can fit your boots, layers, gloves, pants, etc with room to compress down to meet carry-on restrictions. Then you have the medium to stuff full for multi-day road trips.

Well made jacket - I'm impressed with the finish on it - seams are welded cleanly, the fleece lining is nice and soft (but very, very thin) and the zippers close with very little effort. The fit IS TIGHT (especially mid torso), I have a Small AK Burton shell (3L), which typically run slim and this is far tighter. At 5'8" 135, I can fit a medium weight merino base layer underneath the small welder and that's it. Good wind resistance and the hood is sweet (although haven't tested flying down the mountain yet).

They size a bit small - I wear an size 8 hestra glove and the medium liners are a bit tight - short in the finger length, but overall fit my hand. The quality and comfort is great, like all Icebreaker merino.

Like just about everything else Icebreaker, these are great. Warm, comfortable and no stink! I've worn them for multiple days of skiing and they don't hold smell like synthetics (like underarmour). I'm also fine in just these under my unlined goretex pants down to about 15 degrees.

Bought a medium - big enough for ski boots & assorted gear/clothes for a weekend trip. An underpacked medium *should* fit as a carryon. I'm going to try thin in about a week.