For road bike, road clipless with Lake CX301s, in their wide fit they are ridiculously lightweight, comfortable and breathable.
On touring / commuting and gravel bike, used to ride flats with cheap Decathlon skate shoes and got on well with them, comfortable, grippy, fairly thin sole which makes it the best cycling non-cycling shoe. Then I switched to MTB flat pedal shoes - Specialized Skitch to be precise - and that is a significant improvement in feel.
If you really like flat pedals, and offroad or for commuting or so I really do, get a good pedal with some sort of pins and flat pedal bike shoes. It's totally worth it.
Last edited by Branko D; 08-31-21 at 04:00 AM.