These boots are great and I mean great quality.  I searched countless hours on amazon trying to select the perfect boots for my sons school trip.  I was a bit hesitant to buy since some people were saying the straps broke off. I am so glad I disregarded that and purchased these boots anyhow.  I got my son a size 10. His calves are medium to big and these boots fit good around the calves.  They also fit well with regular socks on.  However, he did say it fit snug with thermals on.  He still wore it with the thermals. These boots are a bit bulky looking but heavy duty for the snow.  He also said it kept him dry in the snow.