Hook the boot heel on a step and point your toes downward to confirm that the boot will hold your foot securely in place during long descents. If possible, try on boots with the load you'll be carrying in the field. Throw 50 pounds on your back and the backpacking boot that felt stiff and awkward a moment earlier will suddenly feel like the right tool for the job. Regard any purchase as tentative until you've had the chance to wear your new boots around your house for a few days. Most shops will accept returns of boots that have never been worn outside.
Support is determined both by the materials and the type of construction.
Materials and construction also determine how long that support will last. Let's start with the boot's upper, which includes everything above the sole, and work our way downward. Less expensive split leather is cut from inner layers of the hide. Seams are also potential leak points. Finding a Fit Boot Go to GORP's Gear Forum to ask questions and offer advice on boots and other outdoor footwear.