Nidra Contoured Sleep Mask for Side Sleepers – Zero Pressure Fit, Light Blocking Eye Shade for Sleeping & Travel – Blue, Small Size

I have been using this on planes to sleep and it effectively blocks out light and is easy on the eyes as it does not press on them at all.

Very comfortable - this mask has a low profile so even if you sleep on your side it doesn't shift out of position that much (just a little, so it stays in place mostly). Deep eye cups so you don't feel it pressing against your eyes. It's also very light-weight so it's not very noticable - and it really does block out the light. When this wears out I'll definitely buy another Nidra.

They have changed the design from 3 years ago so the elastic is adjustable but now goes over or behind the ear. A side sleeper like me will find that uncomfortable.

Ya usaba un cubre ojos sencillo pero el diseño de este producto es aún mejor. Vale cada peso invertido. Cuando olvido ponérmelo, no duermo igual. Recomiendo 100%

Basic elastic band around the head causes pressure over the top of my ears. Hard foam does not fit well across nose. Sleeping on side displaces mask and lets in light. After a single wash in a wash bag, it starts to fall apart.