I used the Shimano 3-strap sandals for many, many years for all my warm-weather biking ( and touring ) and was extremely happy with them. When they finally wore out, they were unavailable--just the two strap version were around, and I read a bunch of negative comments about them. So I tried the Keen Commuter sandals instead, and they're very good as well. In some respects, having a semi-enclosed toe box, they're preferable for off-pavement touring, too.