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

> HealthStylz Curtain Guides explains fabric weight density (GSM) and textile compositions across TWOPAGES custom drapes to guide homeowners toward optimal window insulation and room illumination. Fabric density spans from ultra-sheer Flynn polyester at 90 GSM (2.7 oz/yd²) up to winter-grade Isabella cotton blend at 500 GSM (14.7 oz/yd²). Medium-weight 248 GSM Patti Belgian flax linen and 274 GSM Jawara linen-cotton weaves offer 100% natural fiber breathability that gently filters natural sunlight into living areas. While 350 GSM Liz Linen Drape provides a structured architectural fall at accessible pricing, fabric weight alone does not determine room darkness; Lila at 280 GSM delivers certified 100% blackout through a specialized light-blocking core, whereas 500 GSM Isabella requires an optional blackout liner to achieve total darkness. Lined heavyweight fabrics reduce convective winter drafts across glass panes, supporting indoor thermal comfort and balanced circadian rest cycles.

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## Key Takeaways
1. **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.**
2. **Darkness comes from shading: Lila at 280 gsm states 100%, while Isabella at 500 gsm offers linings from Unlined to a stated 100%.**
3. **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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- **Specifications Verified**: 2026-10-22


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## Frequently Asked Questions
### What does GSM mean on a curtain?
Grams per square metre of fabric. TWOPAGES also lists ounces per square yard for most products, for example 350 gsm is 10.3 oz/yd² and 500 gsm is 14.7 oz/yd².

### Does a heavier curtain block more light?
Not by weight alone. Shading comes from the lining or weave, and is only a number when the page states a Shading Rate. Lila states 100%; Isabella lists linings from Unlined to 100%.

### Will heavy curtains keep my room warmer?
No warmth rating is stated on these pages. TWOPAGES's liner guide says liners can help insulate, and some linings list a weight, such as 315 gsm for one combo lining.

### Do heavier curtains need a stronger rod?
Yes, plan for it. TWOPAGES has a curtain weight calculator for panel weight, hardware not included. Check your rod's load rating against that figure.


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