The complete guide
How to Choose a Silk Sleep Mask That Actually Stays On and Blocks Light
The problem with most sleep masks
Almost everyone who buys a sleep mask buys a cheap one first. It usually comes free with a flight, it is a flat rectangle of polyester with a thin band, and it does two annoying things. It presses on your eyelids, and it slides up your forehead somewhere around three in the morning. By then you are awake, the sun is coming through the curtain gap, and the mask is on the floor.
The second problem is heat. A flat synthetic mask traps warmth against the thinnest skin on your body. In a Durban summer that is uncomfortable within twenty minutes. In a dry Highveld winter it is less of an issue, but the fabric still feels scratchy and dead against the face.
A 22 momme mulberry silk sleep mask fixes the fabric side of that, and a 3D contoured shape fixes the pressure side. The two together are why this style has become the default recommendation for anyone who actually sleeps in a mask every night rather than once a year on a plane.
What momme means and why 22 is the number to look for
Momme, pronounced "mummy", is a weight measure. It tells you how many pounds a specific standard area of the silk weighs. The practical translation is thickness. Silk sold at 12 or 16 momme feels thin and a little papery, and when you hold it up to a lamp you can see through it. At 22 momme the fabric has body. It falls in soft folds, it feels cool to the hand on first touch, and it does not go translucent.
For a sleep mask, thickness matters twice over. A heavier silk blocks more light on its own, before the shape of the mask even comes into it. And a heavier silk survives washing better, because there is simply more fibre in each square centimetre to wear away.
The grading is a separate thing. Mulberry silk gets graded from A up to 6A based on the quality of the raw filament, mainly its length and consistency. 6A sits at the top. You will see the phrase on a lot of listings, so treat it as a useful signal rather than a guarantee, and pay attention to whether the silk is on both faces. That is the question that separates a real 22 momme silk sleep mask from a mask with a silk cover and a polyester lining.
Why the contoured shape changes everything
Flat masks work by lying on your face. Contoured masks work by arching over it. Each eye sits inside a moulded cup, with air between the fabric and your eyelid. You can open your eyes fully in the dark under one of these and feel nothing.
If you wear lash extensions, this is not a nice-to-have. A flat mask crushes extensions against the lid for seven hours and shortens their life considerably. A contoured mask leaves them alone. The same logic applies if you have had any eye procedure, or if you simply find pressure on the eyes unpleasant, which a lot of people do without ever naming it as the reason they gave up on masks.
The other benefit is light. The contour creates a raised rim that follows the brow bone and runs down either side of the nose. That rim is what seals, not the flat fabric, so the mask can block light without having to be strapped on tightly. A blackout eye mask that works at a loose setting is a mask you can wear all night.
The strap is not a minor detail
Look at how the band attaches. Cheap masks use a sewn-in elastic with no adjustment, or a plastic slider that ends up sitting right where your head meets the pillow. Both cause the same problem for side sleepers, a hard point digging in.
This mask uses a silk-wrapped elastic strap with a buckle. You set the length once, to your head, and leave it. The silk wrap means the part running behind your ears is smooth rather than scratchy, and a buckle lies flatter than most sliders.
Setting it correctly is worth five minutes on the first night. Put it on sitting up, tighten until it holds without pressure, then lie down on your side and check whether it has shifted. Adjust from there. Most complaints about masks sliding or leaving marks come down to tension set by guesswork rather than by trying it.
Who this suits
Shift workers get the most out of a good mask, because sleeping through daylight is the hardest version of the job. Nurses, security staff, people on mining rosters, anyone sleeping between a morning and an afternoon. If that is you, the combination of 22 momme weight and a contoured seal is the right place to spend money.
Travellers are the next group. A mask that packs into a pouch and weighs almost nothing is easy to keep in a carry-on permanently. The adjustable buckle means you can wear it loose for a nap and firm for an overnight leg.
Light sleepers at home, people with a partner who reads late, anyone in a flat with a streetlight outside the bedroom window. And new parents, who are not sleeping much and want the hours they do get to count.
Side sleepers in particular should look at contoured designs over flat ones. The shape and the smooth silk mean less drag against the pillow.
How to choose between options
Check four things when you compare masks.
First, is the silk on both sides, and at what momme? If a listing gives a momme number but will not say what the lining is, assume the lining is not silk.
Second, is it contoured or flat? Flat is cheaper and packs smaller. Contoured is better for comfort, lashes and light control. If you already know you dislike pressure on your eyes, the choice is made.
Third, how does it fasten? Adjustable beats fixed. Buckle or ribbon tie beats a plastic slider for side sleeping.
Fourth, how do you wash it? Hand wash only is normal for silk at this weight. If you know you will never hand wash anything, be honest with yourself about that before buying.
Looking after it
Hand wash in cool water with a detergent made for delicates. Not dish soap, not normal laundry powder, both of which are harsher than silk likes. Swish, do not scrub. Rinse until the water runs clear.
Never wring it out. Lay the mask between two halves of a clean towel and press. Then dry it flat, out of direct sun, because UV fades dye and weakens the fibre over time. Keep heat away from the elastic.
Wash every week or two depending on use. More often if you apply creams at night, since oils build up in fabric whether you can see them or not. Store it in the travel pouch rather than loose in a drawer, which keeps dust off and stops the silk catching on anything.
Done this way, a silk mask lasts years. The elastic usually softens before the silk does.
What is in the box
One mask, one travel pouch, one gift box. Total packed weight is 200 g, and the packed dimensions are 26.29 x 12.19 x 3.2 cm (10.4 x 4.8 x 1.3 in). Those are the box figures, not the mask. The maker does not publish a finished mask measurement or a strap length, which is common for adjustable items.
Delivery is tracked to every province and takes 10 to 20 working days. It is free on orders over R1800 and R250 below that. Payment is by card. If it turns out not to suit you, there is a 14 day window from delivery to cancel for any reason, provided the mask is unused and unwashed.
The short version
If you want a mask you will actually keep wearing, the two things that matter are fabric weight and shape. 22 momme mulberry silk on both faces gives you something soft, breathable and durable. A 3D contoured cup keeps it off your eyes and lashes while sealing out light at the brow and nose. The adjustable buckle strap handles the fit.
Burgundy, one mask, pouch and gift box included, hand wash only. That is the whole thing.