Which Fabric Weight for Which Season? A GSM Planning Guide

Short answer: as a planning rule — 120–180 GSM suits summer pieces, 180–260 GSM covers spring and autumn, and 260–400 GSM belongs to winter. Within each band, fibre and knit structure shift the feel, so weight is the starting point, not the whole answer.

Planning a range by fabric weight keeps collections seasonal, controls cost and prevents the classic mistake of launching a summer tee at a winter weight.

The Weight Bands and What They Do

Lightweight: 120–180 GSM

Medium Weight: 180–260 GSM

Heavy Weight: 260–400 GSM

Fleece and French terry sit mostly in the heavy band; jersey spans light to medium.

Fibre and Structure Change the Feel

Weight alone does not decide warmth or comfort:

Two fabrics at the same GSM can serve different seasons if fibre or structure differs. Always plan weight together with fibre and structure.

Planning a Range by Weight

A balanced knitwear range typically spans the bands:

This spreads risk across seasons and keeps the customer in your range year-round.

Climate and Market Matter

The same weight sells differently by market:

Plan weights for the market you actually sell into, not for a global average.

Cost Implications

Weight is a direct cost multiplier — heavier fabric uses more yarn per square metre:

If margins are tight, an efficient medium-weight range is easier to run profitably than a heavy one.

What to Specify

Conclusion

Fabric weight is the first decision in seasonal planning: 120–180 GSM for summer, 180–260 for the shoulder seasons, 260–400 for winter. Weight works together with fibre, structure and finishing, and the right mix depends on your market's climate and price point. Plan ranges across weight bands deliberately and your collection will feel right in every season it ships.

Key Takeaways for Buyers

About HONGTEX

We knit, dye, cut and finish under one roof, which is why our sampling does not queue behind an outside dye house. Development samples come back in 7-10 days and the fee is credited against bulk. Send us the spec and we will tell you honestly whether a style needs full development or can go straight to a pre-production sample.