I have a pair of sidi vertigo's which are vented and I really only notice then working when it's cold.
If I happen to have then open in the cold my foot gets cold so they definitely work but when it's hot I don't really notice them being open because it's so hot but they definitely work.
If I happen to have then open in the cold my foot gets cold so they definitely work but when it's hot I don't really notice them being open because it's so hot but they definitely work.