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The stretchy material makes it easy to get a good seal without any pinching, and it's held up really well through several sessions. Finally a comfortable and durable option for pumping.

The stretch-to-fit material makes a noticeable difference over the rigid seals I'd been using, no pinching at all once it's on. Sessions actually feel comfortable enough to relax into now instead of constantly adjusting.

The stretchy seal actually stays put during a session instead of pinching like the hard plastic ring I had before. It's way more comfortable and I've been able to go longer without stopping.