BackCountry.com:

The North Face Mens Baltoro HV 400 boot offers the protection you need from every element imaginable. Rated to -40 degrees Fahrenheit, the Baltoro HV 400 is primarily a winter boot. However, it excels in inclement weatherrain, snow, slush, sleet, and the occasional frog falling from the sky doesnt stand a chance of penetrating the HyVent waterproof barrier, fleece-lined collar and tongue lining, or waterproof Nubuck leather upper. As a result, your feet stay incredibly comfortable, warm, and dry. Regulating your foot temperature is an Outlast footbed. Outlast prevents overheating and sweating by absorbing excess heat, then releases that same heat when the temperature drops to maintain a comfortable, consistent temperature inside the boot. The 400-gram PrimaLoft insulation keeps the ride cush, and the Baltoro HV features a D-ring gaiter attachment for when the weather really turns nasty. The soles show no mercy to the ground you walk onThe North Face Winter Grip soles ensure you wont end up face-down on those icy patches.

BobWards.com:

The Baltoro is a perfect boot for active winter activities. It's waterproofness and comfort make this boot a must for any snowshoer, snowmobiler or any winter recreationist.