Bought a pair on Kennetrek Mt Hunters last winter. Wore them this summer and fall to break them in. Feel great. No problems on flat, downhill or mild climbs. The 3rd day of my hunt we started doing some pretty steep climbs and both my heels got blistered up bad. Any ideas what to do other than gorilla tape on the heels or try different footbed inserts? Size is correct i feel. Maybe a half size down would work but don't wanna buy another pair just yet.