I was skeptical about the two-ring setup, but stacking both at the base gave a noticeably firmer hold and I lasted longer than usual. The stretch is generous enough to slide on without pinching, and cleanup afterward was easy.
Stretching them on took a second the first time, but the TPE gives way more than I expected and both rings sit snug without pinching. Definitely noticed the difference in how long I last compared to going without.