For serious walking (or triathlon) I prefer more support, too. That's why I love my Chacos even more than Keens. The arch and sole and strap placement on Chacos just work beautifully with my picky feet.

http://www.rei.com/online/Search.do?...haco&x=25&y=11

I have Z1s, Z2s, and Arturos. I can wear all with socks or without. (toe socks with the Z2 sandals) They can be resoled and rewebbed. Dog ate the straps on one of my Z2s and Chaco rewebbed the entire sandal for only $15. (and it only took a week!) Chaco's customer service is fabulous. There have been murmurings that Chaco is planning a SPD sandal. All my Chacos are very comfortable on the bike. No hot-foot.

My oldest pair is about 8 yrs old now, and even though I wear them a LOT, I only just this year decided I really do have to get them resoled. After the warm weather, of course...