The toe box should be larger so I recommend buying a half to a whole size larger.  In snow and ice I wore Yaktraxx on my other boots but found they were not necessary with these boots.  The rugged soles provide all the traction necessary on ice and snow.  My #100 dog pulls hard on the leash when we are out walking and he sees a deer but I am able to maintain my position and hold him in ice and snow in these boots without wearing ice cleats.  Now if only I could get deer to wear Hoover vacuum costumes everything would be great!