I just bought these a few weeks ago, and I am impressed. The Irish Setter 3888 Snow Claw XT. 2000 gr insulation and aerogel in the midsole.I have been wearing Scheels extreme weather wool socks in these, and have sat for 5 hours in zero degree weather, and my feet kept warm. I bought these one size bigger then I normally wear, for Scheels two sock system, and am very glad I did. I also own a pair of Ice breaker boot blankets, but so far, no need for them. These are the 1st boots I have ever owned that have kept me warm. I thought I would pass the info on. $159 at Scheels.

http://www.irishsetterboots.com/iris...xt-realtree-ap





Men's Irish Setter 3888 Snow Claw XT 2000g ThinsulateŽ Insulation Waterproof 10-Inch Boot
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Irish Setter 3888 Snow Claw XT 2000g ThinsulateŽ Insulation Waterproof 10-Inch Boot
RealtreeŽ All-Purpose Camo

Description:
Aerogel is a material composed of over 90% air - making it an extremely effective insulator with the lowest thermal conductivity of any solid material known to man. The aerogel in the midsole of the Snow Claw XT serves as a barrier to heat loss between the foot and frozen ground or snow.

Features:

* UltraDry - Complete Waterproofing System
* ScentBan - Eliminates bacterial odors
* EVA with Thermal Boost Nanotechnology Midsole
* Snow Claw Sole
* RealtreeŽ All-Purpose Camo Uppers
* Cement Construction