They literally take a burden off your feet. Sturdy, flexible, and comfortable, they are perfect for hiking and most backpacking. Welts are stitching systems that join boot to sole. The better the welts, the stronger the join. Hence welts make shoes that are more water-tight, more durable, though perhaps less flexible.
Lighter shoes use bonding-cement joins.
Cycling shoes . Try touring in soft running shoes. Your toes will go numb. Cycling shoes with stiff soles distribute pressure evenly over more of your foot, preventing numbness, encouraging comfort. But at a price.