The airtight seal on this thing is no joke—it stays put no matter how much you move around. I've tried cheaper ones that slip or tear, but the elastic TPE stretches without losing grip.
Julian★★★★★
The TPE material feels surprisingly soft and stretchy, and it grips well without any slipping. Cleaning takes a bit of effort since it's not removable, but the sensation more than makes up for it.
Matthew G.★★★★★
The airtight seal on this thing genuinely surprised me, stays put no matter how much I move around. The elastic TPE stretches just enough without feeling flimsy.