Questions about KAO Steam Eye Mask Yuzu Scent 12pcs

It reaches around 40°C and holds a comfortable warmth for about 20 minutes, then gradually fades.

No. It warms itself the moment you open the pouch, so there is no microwave or plug involved. Use it straight away once opened.

No. The mask is designed for about 20 minutes of use while you are awake, so you can remove it whenever you like. Wearing one while asleep means prolonged warmth against the same spot, which can cause a low-temperature burn even at a temperature that feels comfortable. Take it off before you sleep.

Yes, and it is popular for exactly that. The pouch may puff up a little in cabin pressure, which is normal and not a problem.

Do not use it if you have an eye condition, unless a professional has told you it is suitable, and do not use it immediately after eye drops or together with an eye pack. Always follow the label directions.