The insoles are not removable. I opened and laid flat the top of the boot and it measures just under 14". There is a slight sketchiness to the top of the boot. I have average sized calfs and love that the boots are fitted.
Size 9s are 15" at the widest, down to 10 1/2 at the ankle. The 8.5 size I normally wear were too snug all around but sizing up.5 was perfect. Insoles are not removable but there is nice room in the toe box with the extra .5. Had these boots a few weeks now and LOVE them.