These boots are sick! They are super comfortable, and are by far the best boots I have worn. Heel lift is minimized and the boots mold to my feet while keeping them nice and warm. The only beef I have with these boots is that I have to re-tighten them after I walk in them for a few minutes. It's like the boot relaxes and starts to mold to your foot, so you should crank them down again before your first run. Other than that, they are crazy!