Kinda funny about the flip flops - I’ll actually change into them for rain if it’s more than a sprinkle. I’ve found flip flops or sandles and thicker socks, depending on how chilly it may be, to be my preferred rain footware by far. Your feet are dry in no time as soon as the rain stops(ditch the thicker wet socks). Wet shoes are terrible and flip flops are multi-functional and useful off of the bike, whereas shoe covers are single use and nearly as bulky.