I've got the middle side cage and 2nd smallest ring from the Starter Pack from LockedGuys. I don't know why I keep getting that burning and chaffing under the base ring. I feel like I should be past that by now. I'm looking at a custom cage from BAWPro. lockedguys.com/products/cha...
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The bawpro cage can get a better fit on the gap between cage and the ring, and have an integrated scrotum bar to keep my balls from popping out. I want to be able to play with my husband while wearing it and not be uncomfortable or worry about popping out. I also want to give him the keys.
Two things I can think of offhand - there may be a rough spot inside the ring, or maybe you're allergic to the black dye. (Although that tends to be an all-over rash. For what it's worth, the real Cobra cages have a smoother finish.
Are you using a lotion, silicon lube or something like Vaseline (applied lightly to your cock and balls; where the cage and ring are touching. I use Vaseline and put a little on the ring and cage also. The chafing went away. You may need to apply again later in the day if you’re sweating a lot.