I love Spira shoes.  I'm a nurse with alot of standing demand on my legs.  These Spiras make all the difference in diminishing my leg and foot fatigue.  The yellow is very, very bright.  The young people around me love them.  The friends who are 40-plus aren't show sure.  I don't care what they think.  They are also wonderful for running.  I feel bouyant in these and, believe me, I am not very bouyant.  I normally wear a size 8 1/2 to a 9.  I purchased a pair of Spira runners that were 9B-C and they were a tad bit too short and not wide enough.  With these I bought a 9 1/2 C-D.  They're  slightly too wide but my feet are not squished.  I've worn  them for 12 hours without my feet and legs tiring, and I was on my feet 80% of that time.