It's -10 degrees this morning and I wore them outside to let out the dogs. I will be wearing them when it's 90 out this summer. I have been wearing Haflingers as my everyday indoor shoe for a dozen years or so. They keep your feet warm when it is cold and not overly hot when it is hot and they are ever so comfortable. They mold themselves to your feet over time so you have a totally custom fitting pair of slippers. I'm so glad I discovered Haflingers!