I almost always wear flats and am not used to heels, yet I can wear these cute sandals comfortably, and without stockings (which I loathe).  My shoe size is a 6 and 1/2 wide (my heel is narrow but my toe area is wide).  Since there were no wide widths available, I decided to order a 7 medium. As it turns out, I could have gotten a 6 and 1/2 medium, as the toe bed is roomy enough -- at least in cooler temperatures or air conditioning.  But I decided to keep the size 7, to allow for feet swelling in hot weather.  I punched an extra hole in the strap (using the tips of pointed nail sissors), so I could tighten the buckle around the ankle.  Of course, any time one wears a new style of footwear, there is an adjustment period if one does extensive walking.  But so far, with light walking, these sandals have been great for me.