Spira has become one of my favorite brands of shoes!  The springs in the forefoot and heal allow me to stand for hours (almost) and let me walk further than I have in a very long time.  I have worn orthotics in my shoes since the mid-1980's and typically am unable to stand for any length of time at all.  These Wavewalker's are one of the best shoes I've ever worn and seem to be true to fit.