Nexcare Tegaderm Waterproof Transparent Dressing, Dirtproof, Provides Protection To Minor Burns, Scrapes, Cuts, Blisters And Abrasions, 4 x 4.75 in, 4 Count | S&S Amazon $2.55

Bought these when my child cut his knee open and we were headed to a pool for a week. No other bandage / Band-Aid would stay on, including the waterproof ones. This sealed the cut in and let him swim all day. These are my go-to now for cuts in hard-to-bandage, places. Best deal I've seen.

https://www.amazon.com/dp/B004MBW...etail_page

Description
Ideal for covering & protecting wounds
Seals out water, dirt & germs
Up to 7 days' wear
Imagine watching your injury heal, right before your eyes. Nexcare Tegaderm Transparent Dressing lets you bring hospital grade products home to your family. Low profile, this film dressing adheres to your skin to completely shield your injury from water, dirt and germs, while allowing your wound to breathe. The flexible and comfortable design lets you keep up with your favorite activity and you can wear this dressing for up to a week. The days of lifting up your dressing to sneak a peek at the healing process are over. Give yourself and your family the protection of Nexcare Tegaderm Transparent Dressing and care with confidence.
The #1 hospital brand
Provides protection to minor burns, scrapes, cuts, blisters and abrasions
Stays on skin for long periods of time with minimal skin irritation
Stays on during water activities, showering and bathing
Easy-to-apply and remove
Virtually transparent material allows for continuous observation of the wound
Allows moisture to escape while allowing oxygen in for breathability
Flexes and moves with body for greater comfort
Trusted by doctors and nurses in hospitals for more than 25 years
Hypoallergenic
Package contents: 8 count
Size: 2 3/8" x 2 3/4", 4" x 4 3/4"
Color: transparent
Not made with natural rubber latex
Made in United States