Purchased the "Dark Sapphire" in M/L and really liked it. Followed up with Khaki in same size but this one seems to be a lot more snug and longer in length as well. Odd, but does keep me warm, I imagine it should stretch after some use, but wasn't expecting such a dramatic difference from my first purchase.
Keeps you warmer than you might think even when just around your neck and then doubles as a very convenient mask when you need it. its a little small for my, apparently, huge head but that is the only knock against it.