On my search for the perfect insulation piece, I came across this. Since we all tout merino and I could drown in the amount I have, it caught my eye with 70 g of "merino wool insulation." Final weight of 15 oz.

http://shop.ibex.com/Apparel/Mens-Vests-Jackets/M-Wool-Aire-Sweater

Anyone have any experience?

Edit: In the video it claims to have 90% merino and 10% Ingeo fill. They have a heavier hooded version on a decent sale too.