If I recall the sizing is dependent on whether you want to double up on insulation. Stegers are great, but if you are somewhere that the snow is slushy they may not be a good choice. In the Snow Walkers Companion, Garrett Connover suggested using inexpensive rubber over-boots on slushy days. However the Connovers live in Maine and likely do not run into wet snow all that often. I'd love to accidentally trash all my winter footwear to have an excuse to buy a pair of Steger's.