These shoes conform to my foot and yet give my toes plenty of wiggle room.  I'm a heavy guy that has been running about a mile a night for the past couple of months, so not like a serious marathon runner or anything.  My old shoes would reward me with blisters on the balls of my feet and aching joints after a good workout session.  These shoes though, it's like they were made by angels because it's like running on a cloud.  They're also very light and cool compared to my old shoes and my joints don't ache so much the next day.