This is a CBD classic. With a sturdy 4.5cm heel, this black leather boot features gussets on one side and a half zip on the other side to expand the calf width if required. Otherwise, just leave it zipped up. SIZING TIP: CBD is a C-fit brand. A 42=size 10, a 43=size 11, a 44=size 11.5, a 45=size 12 and a 46=size 13.