Take a look at http://www.hellyhansen.com/press/winter-12-13/h2-flow-midlayer and then also click on the link under "Press releases" See if that gives you the specs you want. ~~eArThworm ________________________________ I wish they'd give the specs and not just the hype http://www.popsci.com/gadgets/gallery/2012-03/goods-april-2012s-hottest-gadgets?image=1