This Patagonia Micro Puff Vest just arrived and it is about 2" larger in circumference than my older Patagonia Nano Puff vest. Patagonia is calling it Medium "Regular Fit" on the tag. Color is Norwhal Grey outside, and black inside. I am 5' 10" and 150 lbs. It appears to be designed for somebody a bit larger than me.
Before I send it back, I thought I'd offer it here for $85 including shipping, which is just slightly less than I paid. This vest retails for $129 and is in perfect brand new condition.
Image is from the web, not the actual vest.