The "and petites" is the important part there!!
Gals, I'm 13 inch calf circumference, with no more than 13 inch high shaft. So proportionately speaking, I'm not really a "narrow" calf - I'm average -- for someone who's leg is short enough that anything over 13 inches high is too high.
Now go plug those measurements into zappo's, and see what my choices are, and you'll understand why this is GREAT news.
Booties are wonderful too (though pose their own set of fit problems for petites), but are impractical when you have 5 feet of snow on the ground.