So wet my old holytrainer v1 the nearly largest ring worked great I thought. Kept it on balls didn't slip OK I could still slip out the top and cheat. When I felt I needed to. Usually just an edge. Received my v2 short the other day and the gap and slop is much greater. It's a Chinese knockoff. I am sure the real deal would be better. Instantly I discovered I had to use much smaller ring due to gap. At one and a half weeks I tried to slip out and. O Shir. What the. Aaaarrrregggghhhhhhh. The smaller ring holds the top firmly. Shiver. Sides firm. Nothing I fill it when soft and the most I could get was pulling the tip back some. Mistress absolutely loves the security and it's clear so it looks like its packed in saran wrap only hard.