Terrible! What does Altra think of Version 4?!?! These things look great, but what the heck is going on inside those shoes?!?! There is a piece of material on the inside of the foot in the shoe that connects to the tongue and is an absolute deal breaker. This piece of fabric (not sure what purpose it serves) makes these shoes very uncomfortable. It feels like something is stuck in the shoe and rubbing against the leg. I plan to contact Altra and tell them how frustrating and idiotic this design is. Returned!