I have trouble with almost all shoes & boots causing severe blistering on my heels within minutes of wearing them. These boots were completely comfortable from the 1st wear. Posed no problems at all which is a huge miracle. I have spent hundreds of dollars on boots that I can't wear. Keen is an exception. They were true to size. I ordered a 9.5. I have wide feet. They are ever so slightly snug at my pinky toe but I fully expect they will stretch out nicely after a few wears as they are leather. I would not order any bigger. Easy to pull on and take off.