What GSM Should Linen Sheets Be? A Guide to Linen Weight

If you have spent any time comparing linen sheets, you have probably run into a number you were never given a reason to care about: GSM. It sits in the specs next to the price and the size chart, and almost nobody explains it.

GSM is the single most useful number on a linen bedding listing. Here is what it means, what range to look for, and how to use it to tell good linen from thin linen before you spend the money.

What GSM actually means

GSM stands for grams per square metre. It is a straightforward measure of how much fabric there is: take one square metre of the cloth, put it on a scale, and the weight in grams is the GSM. Higher GSM means a denser, heavier fabric. Lower GSM means a lighter, thinner one.

Unlike thread count, GSM cannot be inflated by counting plies or twisted yarns. It is a physical weight, which is exactly why it is the number linen makers use internally and the number worth asking about.

The linen GSM ranges you will see

• Under 140 GSM — very light. Fine for summer curtains or shirting, but it will feel flimsy on a bed and wears through faster at stress points.
• 140–160 GSM — light bedding weight. Cool and airy, but the drape is thin and the fabric can look transparent against a dark mattress.
• 165–175 GSM — the bedding sweet spot. Enough body to drape and hold its shape, still breathable enough for a hot night.
• 190 GSM and up — heavy. Beautifully substantial, but slower to dry, heavier in the wash, and often more than an Australian bedroom needs.

Why 165 to 175 GSM is the range we make

All of our French flax linen is woven in the 165–175 GSM range, and that is a deliberate choice rather than a marketing one. Below roughly 160 GSM, stonewashed linen starts to lose the weight that makes it fall in those soft, sculptural folds — it clings instead of draping. Above about 185 GSM, the fabric takes noticeably longer to soften and much longer to dry on a Melbourne winter line.

The 165–175 band gives you linen that feels substantial in the hand the day it arrives, softens quickly with washing, and still breathes properly in February. It is also durable: heavier yarn means fewer thin spots and a sheet set that outlasts cotton several times over.

Does higher GSM mean warmer sheets?

Partly, but not as much as people expect. Linen's warmth comes far more from how you layer it than from the weight of a single sheet. A 170 GSM flat sheet under a linen duvet and a quilted blanket will beat a 200 GSM sheet on its own every time. We covered the full layering method in is linen bedding warm enough for an Australian winter, and the insert side of the equation in the linen duvet cover guide.

GSM versus thread count

Thread count is a cotton metric. It counts threads per square inch, which is meaningful for fine cotton percale but close to useless for linen, because flax yarns are naturally thicker and fewer of them fit in the same space. A genuinely excellent linen sheet might have a thread count around 80–150 — a number that would look alarming on a cotton label and means nothing here. If a linen listing advertises a 1000 thread count, treat it as a warning sign, not a feature.

How to check GSM before you buy

Look for the number stated plainly on the product page. If a seller does not publish a GSM, that is information in itself. Then check two things alongside it: that the fabric is 100% flax with a stated origin (ours is European flax, woven and stonewashed, then sewn by hand in Hanoi), and that it carries OEKO-TEX certification so you know nothing harsh was used in the finishing.

Ready to compare in person? Browse the full range in French Linen, build a bed from the ground up with a French linen sheet set, or start small with a pair of French linen pillowcases to feel the weight before committing.

Frequently asked questions

What is a good GSM for linen sheets?
Between 165 and 185 GSM. Below 160 tends to feel thin on a bed; above 190 is heavy and slow to dry. Our sheets sit at 165–175 GSM.

Is higher GSM linen better quality?
Not automatically. GSM measures weight, not fibre quality. A 200 GSM sheet made from short, coarse flax will still pill and feel rough. Weight and flax origin matter together.

Does linen GSM change after washing?
Slightly. Linen shrinks a little on the first wash, which pulls the weave tighter and can nudge the effective GSM up. This is normal and part of why linen softens rather than thins over time.

What GSM should a linen duvet cover be?
The same range as sheets, 165–175 GSM. A duvet cover holds the insert, so extra fabric weight adds bulk without adding real warmth.

Is 100 GSM linen too thin for bedding?
Yes. At 100 GSM linen is shirting or curtain weight. It will feel see-through on a bed and wear out at the hems quickly.