I standardized on Asolo 535 boots around 2001 when I found them to be durable enough and comfortable enough for my abusive needs. In 2002, I was pleasantly surprized when a colleague and friend started gifting me his slightly used 535s. He gave me 9 pairs over 5 years. I thought I was set for a really really long time. Everything was going well, but I was not using them up as quickly as they arrived. I stock piled them.
Eventually, I had the same issue with complete mid-sole disintegration for the last, oldest 3 pairs. I went onto Asolo's website and there was a statement saying this is normal and not covered by waranty. Tough luck (that's my editorial.) Since the boots were really quite new and well broken in, I sent them out for resoling at $70-80 each. I had some issues with one resole place and ended up with good results from Rocky Mountain Resole in Salida, Colorado.
The resole was the Vibram Bifica sole and I must say I find it to be an exceptional product. My first 7 pairs of 535s with factory soles averaged 896 miles until the sole wore out. I am just about to wear out my first set of Bifica soles with 1600+ miles. There are other factors contributing to my better boot life these days such as less weight and kinder terrain, but nonetheless it's a bunch more milage.
Even with this significant quality issue, when my inventory dropped to 3 pairs, I picked up my 11th pair of 535s on Ebay.
I typed this all out and I see I'm reliving my post from 2014..
Asolo Boot Longevity? – Read This!
That said I offer this PSA: I once had an EMS boot sole delaminate from toe to arch just below the beckhorn on Dix. That's a bunch of rough trail milage from the car. I tried tape but it pealed off after about 1/2 mile. The solution that made it all the way back was to run a piece of 5mm climbing utility cord wrapped through the lowest set of lace holes and around the sole. pass it two times around and tie it on the top. about 2" of the sole will flap but it is quite managable and the robustness of this cord prevents the abrasion failure. I still carry a small piece of cord for this specific repair.