put me down for sandals. I like the wind blowing between my toes. In spring and fall I add a pair of socks and shoe covers if needed. Very comfortable. In winter I wear LL Bean Snow sneakers. They keep the dogs warm into the negative digits. They just completed their eighth winter.

Depends on which bike and what weather.

Wolverine Boots
Vans
Diadora touring SPD shoes.
Running shoes.

Thinking of getting Giro Alpinduro SPD boots, to add to the collection.

When I was a kid I was riding in flip-flops and my foot slipped off the pedal. Took weeks for my poor tootsies to heal and I decided then and there never to wear open shoes on a bike.

The chain and chainring teeth only reinforce this as a good idea, at least to me... :beer:

I sometimes wear flip flops on my utility bike with pinned platform pedals. Pretty much no chance of slipping off. The flops are actually pretty torn up on the bottom from the pedal pins. However that bike is getting M324 dual-sided platform/SPD here pretty soon.

Keens type fortunately are Not that Open , Summer I have clones of those (sold the Spud Cleat Keens)

Sorry, I should have mentioned that the sandals I wear are Keens. Not your typical "flip-flops". Anyone familiar with Keens knows about their protective toe box. No way your going to scrape your toes on anything with these. Keens were designed for active lifestyles and fit like a shoe but give you that open air feeling that you want from sandals. And as I said before. They are mighty comfortable riding on a bike, particularly when it's hot outside.

Well then you can't have all that much air blowing between your toes!

Louis Garneau T-FLEX 2LS (with MTB clipless pedals)
Mavic Galibier (with road clipless pedals)
SIDI Dominator 5 (with MTB clipless pedals)

Did a search and I see what you mean; they look very comfy and still safe... :beer: