Purchased the Mountain Extreme 400 boots for my dads Montana mountain goat hunt. The order arrived quickly and I treated them with Kenetrek boot wax right away. After wearing them around the house for a while I noticed the in soles were the least bit noticeable. Not really uncomfortable but wasn't sure how they'd feel out in the field. Swapped out the in soles with a pair I had and they felt more comfortable. Don't believe it was necessary but ended up keeping them in. The boots performed excellent on the hunt. No break-in time required which was excellent. Being I didn't have them but a few days before we had to depart for the hunt. They kept my feet warm, dry and comfortable the entire time. I'm extremely happy with my purchase and highly recommend the boots.