I've never worn a cage before, I was mostly after the denial of touching myself during backdoor solo play. This helps keep my focus on other avenues of pleasure. I am a grower 4" to 7" in length and 4" to 6" in girth. The 50mm fits snug enough I don't need a harness if my sack is pulled through enough. The cage does take some adjusting once the key is locked, but I have worn it for over an hour comfortably.