Yeah, and make sure you thoroughly try both pairs you are issued. I got my ICB's to just the right fit, and then assumed the jungles would be exactly the same fit, and so I only tried them on once.
Turned out my jungles were slightly too small, and I had to try and get them returned about two weeks after we were issued them. For some reason or another my ill fitted jungles we returned to me, except instead of having two ill fitting jungle boots, I now had one ill fitting jungle and one ill fitting ICB. I have no idea how it happened, but when I tried to explain it to the company GSGT, I only got chewed out. I half-heartedly tried to raise the issue again, but decided that it went against my "stay under the radar" plan, so I gave up.
So I went through 10 weeks of OCS with one pair of boots. Humps, fords, inspections, everything in that one pair. Make sure you check your boots out very carefully so you don't get screwed up like me. But luckily for me I only got one blisters on time, on the 9 miler.