Just returned from a backpacking trip to Philmont Scout Ranch in NM. Our crew hiked close to 10 miles each day for a week on rocky, muddy, uneven terrain in wet and dry conditions. I carried a 35lb. backpack plus 4L of water and 3 days worth of food at a time and I only weigh 100lb. My feet had been aching on our weekend practice hikes leading up to the trip and I was concerned how they would hold up for more consecutive days. I also tend to have an issue with alignment which affects my right hip. A previous insert recommended by my chiropractor gave me limited help with that issue, but was uncomfortable and did not cushion the ball of my feet where I get sore carrying the backpacking weight. I also have kid sized feet and finding good inserts in my size can be a challenge. Enter Protalus. Not only was I able to find my size, but I also was able to find a pair recommended for use in boots. I bought two pairs. One for my boots and another model for my running shoes. Completed the hike and never had an issue with foot soreness or my right hip going out of alignment! Awesome product, worth every penny!