First of all if you think you're going to take this boot out of the box and then have a good long walk forget it. These boots are solid, sturdy and made out of serious leather and you're gonna have to break them in gradually.  As others have advised go a half size lower. I'm a 10.5 and ordered a 10. When I first put them on I thought uh oh I've made a mistake. First time on I could only wear them for 20 minutes. Well I've been wearing them longer and longer and I can tell they are going to be perfect when they're broken in. Invest in the full complement of Redwing boot care products.  I'd advise anyone to purchase these serious, made in the USA boots

update-10/4 Looking back I probably should have got the 10.5 because my foot is closer to an 11. I really like these boots, worn them plenty and I've mink oiled the hell out of them but they're still not as comfortable as I'd like. I will order another pair of a 10.5's in a different color because theres no way I'm going through another break in period like this one