Comfort and lightness. I last bought this shoe after buying Merrel and ASICS. I walked the Camino de Santiago for 9 days over rocky terrain with loose and hard stones, slippery mud and simulated carrying a 20lb backpack. I was very happy with it. It felt so comfortable, like it was massaging my feet and at the same time gave me a good feeling that my feet wouldn't slip. This is a challenging climb and the weather can be very hot or rainy, but the shoes remain operational. I will say these were the best trekking shoes I have ever owned. It's fast, convenient and light.