I love my Rainbows! It took some time to get used to them but now I'm sad summer is almost over.

http://www.zappos.com/nike-comfort-t...own-violet-pop

I commute and change my shoes when I get to work, so these have been great for the mile or so I walk to/from the train. They are comfortable, but also provide a good measure of support. I am all about investing in a decent pair of flippies instead of getting by with the $1.99 Old Navy pieces of rubber.