Ive never been sure, Ive just used regular sized Durex and Lifestyles.... putting them on is a b*tch, they are tight as hell... is that normal?
Once the thing is on it tends to bunch up though like if it were too loose, which I find weird since it's so incredibly hard to put it on.
Lifestyles are tighter and smaller than normal. Back when I tried using those I had to struggle to get past the head and unrolled they were at least a couple inches up my shaft. And Its not like Im huge or anything.