La Sportiva Thunder III GTX day hiking boots: These boots look great and seemed to fit well in the store. I had a MEC staff member check the fitting and he thought they fit well. I wore them around the house for a while and they felt good, but as soon as I went hiking – pain and blisters. I took them on four hikes, hoping they would break in, but, no such luck. I think it was a combination of the fact that there is a rough seam up the back inside of the heel, and the fact that the sole is very stiff. But, this is exactly why I always buy my gear from MEC – because of their Rock Solid Guarantee I was able to return them hassle-free! I’m going to wait for my heels to heal before I go trying on more boots to find their replacement.