I am on the third set of boot soles... I like the enduro soles (34$). I use fastway evolution airs with spikes for mud and wet conditions and positive grip... I rip through soles in a year. Changing out the soles has saved hundreds of dollars over the last 2.5 years I've had these for racing. Not even sure they have a break in period... They were supple from the showroom floor. All the parts except the leather upper is replaceable... shin panels, front guards.. straps... all of it... Lastly get a good leather conditioner... I didn't treat it right and its now starting to scale... however... I race in Arizona in the winter... and in Colorado in the summer... all dry air areas... with splashes of water. I have to say even with poor care these have lasted for a very long time.