Korkers do fit small. I wear a 11 1/2 shoe and I wear a 13 korker by the time I get my wader in them, The Boa system Draws up all of the loose feel in the boot, I wear them even when I am just hiking withthe Vibram soles, They are way light, dry quickly withthe Stainless mesh panels and give me good support, my only complaint is that the Boa laces area little ackward to attach to my gravel cuffs on the waders, the front clip on my GG has to be twisted to the side slightly because the lace guide is centered on the toungue... not a big deal but that is the ONLY issue I have had with mine.