These are the best boots I have ever owned. They are the most comfortable to wear and the easiest to move in. My feet stay warm and dry even in the worst conditions (think 33 degrees and pelting rain while camping and doing rescue training on Mt. Rainier). The knitted upper dries and thaws out super fast and stays soft and flexible. The boot rivals my running shoes for comfort! Despite the soft and supple upper, it provides plenty of stability with the strategically placed reinforcements. The sole is stiff enough to provide a great climbing platform and works well with all kinds of crampons. It also has a rockered shape that makes walking a joy, especially when compared to walking in other stiff and clunky mountaineering/climbing boots. The rubber on the boot is sticky and climbs well on rock. The lugs provide great traction in snow and dirt. This is truly a 5-star product!