A microwavable heat mask is a reusable compress you warm for a few seconds and rest over closed eyes. The masks in this category hold heat with beads, gels, clay or moisture retaining fabric, and most are shaped to sit across the lids without pressing on them. Plenty of people keep one by the sink and use it as part of a daily routine, often after a conversation with their eye doctor.
Start with coverage. If both eyes feel the same, a dual eye compress is simpler. If you are working on one side, a single eye pad is easier to place. Then think about laundry. Covers that come off and go in the wash stay fresher over months of use, and it is worth checking whether replacement liners are sold separately before you commit to a design.
Heat retention varies by fill. Clay and bead masks tend to stay warm longer than lighter fabric styles, while gel packs are the ones that also work chilled. Warming times are not interchangeable between brands, so follow the instructions printed for your specific mask, and let it cool a little if it feels too warm against the skin.
Warm compresses are a routine, not a one time purchase, so pick something you will actually reach for. If you are unsure whether one belongs in your routine, ask your eye care professional first.