I'll take a stab at it but this is based on the 4 pairs that I have. 1. The quality of the leather is decent to good. My brown double monks, the leather is somewhat veiny in some places. However, on my leather tassels, my museum calf balmorals and suede double monks the leather is very good.2. Insole is leather. The insole goes half way down.3. Corked4. I believe full stack leather5. Liner is leather.