Nestig 通気性防水ミニマットレスカバー

The fit is perfect on our mini crib mattress, and it’s genuinely waterproof—spit-up and diaper leaks barely leave a trace. It’s also thinner than I expected, so the sheet still goes on smoothly without bunching. We keep two on rotation now.

Woke up to a soaked sheet after a diaper blowout and the mattress underneath was completely dry — the waterproof layer actually does its job. It's thin enough that I barely notice it under the fitted sheet, which is exactly what I wanted for the bassinet.

The waterproof layer held up perfectly through the toddler phase, and it fits snugly over the mini mattress without bunching up. I love that I can just wipe it down instead of washing the whole mattress every time there’s an accident.