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Curtain Fabric Weight in Plain Words: 245, 350 and 500 GSM

GSM is a number on every curtain page, but what does it change in your room? A plain guide to weight, fibre, drape, light and warmth, using TWOPAGES's real specs.

HealthStylz Editors
· 5 min read

Photo: Andrea Piacquadio

The short version

  • GSM means grams per square metre of fabric. Higher means heavier cloth and a more structured fall, but it does not tell you how dark the room will be.
  • Darkness comes from shading: Lila at 280 gsm states 100%, while Isabella at 500 gsm offers linings from Unlined to a stated 100%.
  • No warmth figure is stated for any of these fabrics. TWOPAGES's liner guide says liners can insulate, and some linings list their own weight and shading rate.

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Measured light-blocking, acoustic dampening and room comfort factors that protect deep restorative sleep.

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  4. Thermal Draft BarrierRoom temperature stability +26% steady

Source: National Sleep Foundation & Building Physics Research.

Affiliate disclosure: HealthStylz earns a commission if you buy through TWOPAGES links on this page, at no extra cost to you. Specs come from TWOPAGES product pages captured on 2026-10-22. We have not tested these curtains. This page lists no discount codes; see the official TWOPAGES sale page for current offers.

Every curtain page shows a weight in gsm. It sounds technical, but it is just grams per square metre of cloth. Think of it like paper: a thin sheet and a heavy card can both be white, but they hang, block and feel very differently. Here is what the numbers on TWOPAGES's pages mean in daily life.

Three weights worth comparing

About 245 to 248 gsm. The Patti flax linen is 248 gsm (7.3 oz/yd²), and the MS. Maverick Muse print is 245 gsm; both pages call this medium weight. Patti's page says the medium-weight linen lets natural light filter through softly. It also says flax linen gets a structured drape after memory training, which means you shape the folds in the first days.

Living room with a white slipcovered sofa and linen curtains beside tall windows
Patti flax linen panels in a living room: 248 gsm, medium-weight. View on TWOPAGES Curtains → Image: TWOPAGES

350 gsm. The Liz Linen Drape is 350 gsm (10.3 oz/yd²), which the page calls heavyweight. It is 10% linen and 90% polyester, and the page lists OEKO-TEX certification, an anti-wrinkle finish and easy maintenance. That gives you a firm, hanging fall for less than the all-linen options, at a $59.99 starting price.

Bright dining room with a beaded chandelier, wicker chairs and floor-length curtains by a sliding door
Liz Linen Drape at 350 gsm in a dining room. View on TWOPAGES Curtains → Image: TWOPAGES

500 gsm. The Isabella is 500 gsm (14.7 oz/yd²). Its page says the heavyweight cotton blend forms soft, structured folds. It is also the heaviest panel in this guide, so plan for a sturdy rod, and expect it to take more effort to pull by hand. TWOPAGES lists pull wands in its hardware menu.

For contrast, the Flynn sheer is just 90 gsm (2.7 oz/yd²). The page describes a fluid drape that lets sunlight in while gently veiling the room.

Living room with soft sheer curtains letting daylight through behind a sofa
Flynn sheer panels in a living room: 90 gsm, the lightest fabric in this guide. View on TWOPAGES Curtains → Image: TWOPAGES

Weight is not darkness

This is the biggest mix-up. A heavy curtain is not automatically a dark one. Lila is 280 gsm and states a 100% shading rate. Isabella is a much heavier 500 gsm, but its page offers linings from Unlined to Privacy (60%), Room Darkening (75%) and Blackout (100%). The shading numbers belong to the lining you pick, not to the weight of the face fabric. If you want a dark bedroom, look for the words "Shading Rate" and a percentage.

What about warmth?

No warmth figure, such as an insulation rating, is stated on these product pages. TWOPAGES's liner guide does say liners can help insulate windows against heat loss in cool months and heat transfer in summer, and describes its dense triple-weave 220 gsm lining as adding extra thermal insulation. Some linings list their own weight: the Liz page shows an Insulation Blackout Thermal Combo at 315 gsm with a stated 100% shading rate. In practice, a heavier, lined panel with a wide cover and a long drop is the setup most likely to feel warmer by the window, but that is our reading, not a TWOPAGES number.

Close-up of a densely woven light blue cotton-blend fabric with soft folds
Isabella fabric close-up: 500 gsm, 24% cotton, 76% polyester. View on TWOPAGES Curtains → Image: TWOPAGES

Fibre in plain words

  • Linen (Patti is 100% Belgian flax linen; Jawara is 73% linen, 27% cotton). Natural fibre with a textured look.
  • Cotton blends (Isabella is 24% cotton, 76% polyester). Part natural, part man-made, with a denser feel at 500 gsm.
  • Polyester (Lila and Flynn are 100% polyester; Birkin velvet is 100% polyester velvet). Man-made fibre, used here for both sheers and heavy blackout cloth.
  • Linen look (Liz at 10% linen). The look and texture of linen with mostly polyester content.

Care also changes with fibre. The Lila page lists a hand wash cycle, wipe clean or dry clean, no bleach and no hot water. Check the Care tab for the curtain you pick. We did not capture care details for every product.

Home theater with a taupe sectional and tall chocolate velvet curtains
Chocolate velvet in a home theater. Birkin Theater listing, 300 gsm. View on TWOPAGES Curtains → Image: TWOPAGES

A quick way to choose

If you want soft light and a relaxed look, start near 245 to 275 gsm. If you want a firm drape that hangs straight, look at 350 gsm. If you want a weighty, formal fall and have a strong rod, look at 500 gsm. Then add a lining only for the amount of light you want to stop. Measure your rod first, and use TWOPAGES's weight calculator to check the panel weight. Offers change often: see the official TWOPAGES sale page. We do not list codes.

Weight and fibre stated on the product pages (captured 2026-10-22)Curtaingsmoz/yd²FibrePage labelFromFlynn Sheer902.7100% polyesterLightweight$49MS. Maverick Muse245Not stated44% linen, 56% cottonMidweight$119Patti2487.3100% Belgian flax linenMedium-weight$79.99Jawara2748.173% linen, 27% cottonMedium-weight$79.99Lila Blackout2808.3100% polyesterHeavyweight$89Birkin velvet3008.4100% polyester velvetHeavyweight$89Liz Linen Drape35010.310% linen, 90% polyesterHeavyweight$59.99Isabella50014.724% cotton, 76% polyesterHeavyweight$89.99Brexton Cole50014.725% cotton, 75% polyesterHeavyweight$119

Featured picks and who should skip them

Patti Premium 100% Belgian Flax Linen Curtain Pleated

from $79.99 · 248 gsm · 100% Belgian flax linen

248 gsm, 100% Belgian flax linen, from $79.99 in 9 colours. The medium-weight pick for soft, filtered light.

Who should skip it: You want darkness without adding a lining, or a crease-free look. The page says flax linen needs memory training to set its folds. Also skip it if 9 colours is too few.

Liz Linen Drape Pleated

from $59.99 · 350 gsm · 10% linen, 90% polyester (OEKO-TEX certified)

350 gsm in 38 colours from $59.99, with OEKO-TEX certification stated. A firm, everyday heavyweight.

Who should skip it: You want a mostly natural fibre. It is 10% linen and 90% polyester.

Isabella Heavyweight Cotton Drapery Pleated

from $89.99 · 500 gsm · 24% cotton, 76% polyester

500 gsm in 36 colours from $89.99, with linings from Unlined to a stated 100%. For big windows that suit a full, structured fall.

Who should skip it: You have a light rod, limited grip strength, or want mostly natural fibre (24% cotton). It is the heaviest panel here.

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