This shoe is fantastic.  Flexible sole, lightweight, just a mild arch support and breathable.  My  right dominant foot is ~ 10" long & 4" in width and the size 9 Mens Medium width , fits like a glove.  It has a soft but firm quarter so my heel doesn't lift out of the shoe, ~ 1/2" space in front of my big toe & the width is perfect.  I did not have to break in the shoe at all & I have received unsolicited compliments on the looks also!

I am on my feet all day long & need shoes that are  lightweight, breathable, soft with flexible soles,  minimal  heel lift  & a soft flatter sole that doesn't force my foot into unnatural position by a predetermined fixed shape.  I used to wear the Reeboks travel trainer, but Reebok stopped making them ~ 5 years ago & this shoe is way better.  I tried the Saucony Bullet which is also lightweight & flexible but it was was too narrow for my foot

For my feet the Tiger Ultimate 81 is the Ultimate Shoe