One of the things Altra's shoes are known for, is the toe box aka "Foot Shape" fit. I have pretty wide feet so when I first slipped these shoes on I reacted with a "ooohh ahhh" feeling. Finally, a trail running shoe that fits!
The King MT are also considered "Zero Drop" trail shoes. This means that there is no slant from the heel to the toe - this gives the shoe a "barefoot" feel and a more natural gait.
The two key components of a barefoot shoe are drop and stack height. Drop is the height difference between the heel and ball of the foot. When you stand flat on the ground, your heel and feet are at the same height, which means "zero drop." Stack height is the thickness of whatever is under your foot.
So, the King MT measures in at 19mm heel/19mm toe creating a flat, or zero, drop. As a comparison, the Salomon Speedcross 3s are a 29mm heel/18mm toe, making the difference 9 mm and therefore not considered a zero drop shoe.
Don't get scared that this shoe will not provide comfort with the "zero drop" - the King MT shoes are really comfortable! Altra considers this shoe "light cushioning", meaning for more experience athletes or runners who want a fast, lightweight performance. I love the lightweight feeling however, I have friends that prefer a much heavier shoe because they think it provides more stability for them. It's really up to how you want it to fit and what you plan on doing with the shoe.
These shoes are not recommend for road running - the pavement will create a harsh feel. It's best to use the King MT for peak bagging, ridges, mud, softer dirt, and off trail use.
The Altra Ego midsole is an all-new Altra-exclusive compound which is also lightweight, highly responsive and snappy. There is also a flexible wrap-around StoneGuard which give you extra underfoot protection. The StoneGuard protects your feet from sharp rocks and if for some reason it bothers you, you can remove it.
Lastly, the Vibram outsole features 6 mm lugs (or teeth/cleats) to provide you with excellent medial gripping and traction in wet, loose, or rocky conditions. The only other company that even compares to the amount of grip that comes with the King MT are the Inov8 Mud Claw shoes (these were the shoes I used prior to the King MT).