i'm a size 9 and have the boots in a 41, which i find roomy enough to put an insole in there. if you're a 10.5 and you get them in a 10.5, you're are essentially getting 11.5 boots; they are one size bigger. i think it would still be too big, even with an insole. Insoles can fix the problem if they are half size big but can't fix everything. Unless u like ur boots super roomy, i say just be patient for something to pop up.