For those who aren't familiar, Nu Down is a range of insulation gear that uses air for warmth, you can adjust the amount of air in your vest to adjust the amount of warmth. I have last years model of the Mt Whitney vest, black medium for sale. I am 174cm 69kg and this is just a fraction too large for me.
For more on the Nu Down story
https://www.nudown.com/shop/mount-whitney-vest/This piece is in perfect condition, I got it for an OS cold weather trip that never eventuated
Make me an offer, there is no point in high tech sitting in my cupboard
cheers
BW