love this boot!  anything with primaloft I find is warm, light and cozy.  I ordered a half-size up, and glad I did.  They are a bit stiff, but think they will break in nicely.  The vibram soles have mad grip in slick snow.  I have used these already in minus 25 windchill (yes, I am a die-hard hiker) and my feet felt fine, (not actually warm, but consider the temp!) In normal winter temps, they are wonderfully toasty.  The only complaint I have....they went on sale 1 week after I bought them (25%off)  I just contacted Amazon to see if they will honour the price and refund the difference.  In today's financial situation, every penny counts, right??!!  So come on Amazon, honor your business practice.  I will update this rating with Amazon's reaction
*UPDATE*  Amazon DID respond to my request the very same day and refunded the sale difference!!  way to go Amazon....this is why we love you!