Johnson & Johnson Assorted Water Block Band-Aids are 100% waterproof. Shields out water, dirt and germs. Stays on in water and features an invisible bandage to blend with your skin. Unique Quilt-aid pad wicks away blood and fluids from the wound.
I usually hate buying bandages online because they never stick, but these actually repel water like the packaging says. I wore one under a dripping faucet for ten minutes while fixing the sink and it didn't peel at the edges at all. The invisible ones blend in so well you forget it's there.
These stayed put through three days of pool time with my kid, and the invisible ones really do blend in on my knuckles. Took a while to peel off, but they kept the cut dry the whole time.
Took these to the beach last weekend and forgot I was even wearing one until I peeled it off that night. The waterproof seal held through swimming and sand without a single edge curling up, and the invisible style blended right in with my skin tone.