350 GSM Ultra-Heavy Sportswear Fabric – OEM

OVERVIEW

What Is 350 GSM Sportswear Fabric?

350 GSM sportswear fabric occupies a specialized niche — it's the transition point between "heavy wearable fabric" and "technical shell material." At this density, the fabric becomes rigid, self-supporting, and inherently wind-proof without requiring additional coatings.

"350 GSM is where fabric stops being something you wear and starts being something you build with. It's the chassis of a winter jacket — everything else hangs off it."

Unlike 300 GSM — which works well as a standalone hoodie or track suit material — 350 GSM is almost exclusively used as the outer shell in multi-layer garment systems. Its primary job is to hold insulation (polyester fill, down, or thermal batting) in place, block wind and moisture, and withstand the physical stress of quilting, stitch-through construction, and heavy-duty hardware attachment.

Our 350 GSM range is available in 100% polyester (plain weave and ripstop), 80/20 nylon-polyester blend, and 65/35 poly-cotton — each optimized for specific shell applications from sublimated puffer jackets to canvas-style tactical parkas.

350

Grams / m²

350 GSM ultra-heavyweight shell fabric showing dense weave structure

Quality Lab — Sialkot

HOW IT WORKS

The 3-Layer Shell System

350 GSM fabric is designed to be the outermost layer in an insulated garment system. Here's how the layers work together.

Outer Shell

350 GSM fabric — blocks wind, resists abrasion, holds quilting stitches, provides garment structure and shapeThis Fabric

Insulation

Polyester fill, down, or thermal batting — trapped air pockets provide the actual warmth retentionSeparate

Inner Lining

Polyester taffeta or mesh — wicks moisture, provides soft inner feel, protects insulation from body oilsSeparate

DWR Coating

Durable water repellent — applied to outer shell surface so water beads and rolls offOptional

PU Membrane

Polyurethane lamination — bonded to shell back for full waterproofing (5,000–10,000mm)Optional

We can supply all five layers as a complete package — shell fabric, insulation, lining, and treatments — so you get a single-source solution for your insulated garment program. Ask about our shell system bundles for volume pricing.

COMPOSITION

Available Shell Blends at 350 GSM

Each composition is engineered for specific shell requirements — from sublimation-ready puffer jackets to rugged tactical outerwear.

100%

Polyester

Ripstop

Poly Ripstop

80/20

Nylon / Poly

65/35

Poly / Cotton

DWR

Water-Repellent

PU

Waterproof Coat

GSM COMPARISON

Where 350 GSM Sits in the Spectrum

See exactly how 350 GSM compares to other common sportswear fabric weights.

Training Top
150 GSM

Mid Hoodie
220 GSM

Heavy Hoodie
300 GSM

Puffer Shell
350 GSM

Tactical
420 GSM

Industrial
480 GSM

350 GSM is the sweet spot between "heavy wearable" and "technical shell." It's rigid enough for quilting and insulation but light enough to avoid the bulk and stiffness of 420+ GSM tactical fabrics. We can fine-tune by ±5% (332–368 GSM) for custom orders.

PERFORMANCE FEATURES

Why Engineers Choose 350 GSM

Properties that make this weight the gold standard for insulated garment shells.

Naturally Wind-Proof

Dense weave blocks wind penetration without any coating — the fabric structure itself is the barrier.

Quilting-Ready

Holds stitch-through and baffle construction without fiber migration — insulation stays exactly where placed.

Extreme Abrasion Resistance

Withstands rubbing, scraping, and contact friction that would destroy lighter fabrics in just weeks.

Self-Supporting Structure

Stands on its own — garments hold their silhouette without hangers or stuffing, even when empty.

Coating-Optimized

Dense weave is the ideal substrate for DWR, PU, and membrane treatments — coatings bond deeper and last longer.

Hardware-Grade

Supports heavy zippers, snaps, velcro, and drawcord hardware without tearing at attachment points.

Deep Dye Penetration

Maximum fiber mass absorbs dye deeply — colors resist fading even under prolonged UV and abrasion exposure.

Zero Distortion

Doesn't stretch, sag, or warp under load — pattern pieces cut accurately and stay true through production.

APPLICATIONS

What 350 GSM Is Used For

This is a shell-first fabric — every application uses it as the protective outer layer of a multi-layer system.

Puffer Jackets

Ski Jackets

Winter Coats

Tactical Jackets

Down Parkas

Quilted Vests

Equestrian Gear

Motorcycle Liners

Outdoor Equipment

Workwear Shells

Rain Parkas

Insulated Bags

HEAD TO HEAD

300 GSM vs. 350 GSM — Which Do You Need?

The 50 GSM gap between these two weights is the difference between a "heavy garment fabric" and a "technical shell fabric." Here's the breakdown.

Property	350 GSM ← THIS PAGE	300 GSM
Primary Role	Shell fabric for insulated garments Shell	Standalone heavyweight garment fabric
Wind Resistance	Near-total block without coating 350	Good but some penetration at seams
Rigidity	Firm, self-supporting 350	Flexible, drapes slightly
Quilting Suitability	Excellent — zero fiber migration 350	Good for light quilting only
Coating Durability	Coatings last 2× longer 350	Adequate coating life
Wearability (Unlined)	Too stiff for standalone use	Comfortable as standalone garment 300
Hoodie / Track Suit	Not recommended	Ideal 300
Breathability	Very low — warm by design	Low — slightly more breathable 300
Cost Per Meter	10–15% more than 300 GSM	Lower cost 300
Best Use Case	Puffer shells, ski jackets, parkas	Hoodies, bombers, track suits

Bottom line: If your garment has insulation (fill, down, batting) inside it, choose 350 GSM. If your garment is a single-layer heavyweight piece (hoodie, track suit, bomber), choose 300 GSM. Many brands order both — 300 GSM for their hoodie line and 350 GSM for their puffer line.

PROS & CONS

Honest Assessment

Advantages

Naturally wind-proof — no coating required for basic wind blocking
Perfect quilting substrate — insulation stays locked in place
Extreme abrasion resistance — outlasts lighter shells by 3–5×
Self-supporting structure — garments hold shape without stuffing
Coating-optimized — DWR and PU treatments bond deeper and last longer
Supports heavy hardware — zippers, snaps, velcro without pull-through
Deepest color saturation in the entire GSM range
Zero stretch or distortion — pattern accuracy through production

Disadvantages

Cannot be used as standalone fabric — too stiff for unlined garments
10–15% more expensive than 300 GSM per meter
Bulky to store and ship — vacuum-packing essential for freight efficiency
Sublimation requires longer press times (60–90 sec) — slower production
Very low breathability — not suitable for active-wear applications
Requires specialized cutting equipment — dull blades cause edge fraying

Our mitigation: We vacuum-pack all 350 GSM shipments at 40–50% volume reduction for freight savings. For sublimation, our factory uses calibrated heavy-duty presses with extended dwell time — no quality compromise. We supply sharpened industrial rotary blades recommended for this weight class.

PRINTING OPTIONS

Best Printing Methods for 350 GSM

Shell fabric printing is different from garment printing — these methods are optimized for dense, rigid material.

Sublimation printing on 350 GSM puffer shell fabric

Best Results

Sublimation (100% Poly)

350 GSM polyester absorbs sublimation dye deeper than any lighter weight — producing incredibly rich, saturated color. Requires extended press time (60–90 sec) but the results are unmatched for all-over puffer shell prints.

All-Over PrintDeep ColorPermanent100% Poly Only

Most Versatile

Screen Printing

Works on all 350 GSM blends including poly-cotton and nylon-poly. The rigid surface provides excellent print registration — sharp edges, no bleed. Best for bold logos, brand marks, and placement prints on jacket backs and chests.

Any BlendSharp Edges1–8 ColorsBulk Pricing

Rubber patch and heat transfer on 350 GSM jacket

Premium Finish

Rubber / PVC Patches

Heat-sealed rubber or PVC patches are the premium standard for 350 GSM shell garments. They add texture, dimension, and a technical aesthetic that's become the signature look of modern puffer and ski jacket brands.

3D TexturePremiumDurableAny Blend

CUSTOMIZATION

Build Your Shell Specification

350 GSM is the most treatment-responsive weight we offer — every option below can be combined.

01

Base Blend

100% poly, ripstop, nylon-poly, or poly-cotton — match your performance needs.

02

GSM Fine-Tuning

Adjust ±5% (332–368 GSM) to hit your exact weight and stiffness target.

03

DWR Treatment

Durable water repellent — water beads off the surface for 30+ wash cycles.

04

PU Coating

Polyurethane coating for waterproof performance to 5,000mm hydrostatic head.

05

Membrane Lamination

Full waterproof-breathable membrane bonded to shell back — 10,000mm+ rating.

06

Custom Dye / Print

Pantone-matched solids or full sublimation — your design, our precision execution.

HOW IT WORKS

Ordering Process

From first contact to delivery — a streamlined 5-step process.

Inquiry

Day 0

Samples

3–5 Days

Approval

1–2 Days

Production

15–21 Days

Delivery

4–7 Days

Total turnaround: 23–35 days from inquiry to doorstep. Rush orders available in 15–20 days.

ORDER DETAILS

MOQ, Capacity & Lead Time

500 pcs

Minimum Order Quantity

Fabric-only: 200 meters

30K pcs/mo

Manufacturing Capacity

Scalable to 60K+ on demand

15–21 days

Production Lead Time

Rush orders: 10–12 days

FAQ

Frequently Asked Questions

What is 350 GSM fabric used for?

350 GSM is primarily used as outer shell fabric for insulated garments — puffer jackets, ski wear, winter coats, tactical jackets, and heavy parkas. At this weight, the fabric is too heavy and rigid for standalone garments like hoodies. It's designed to be the protective exterior layer that holds insulation in place and blocks wind and water.

Is 350 GSM the same as 300 GSM?

No — the 50 GSM difference is significant at this weight range. 300 GSM is a versatile heavyweight used for hoodies, track suits, and bombers. 350 GSM is noticeably stiffer, more wind-proof, and primarily used as shell fabric for insulated garments. Think of 300 GSM as the heaviest "wearable" weight and 350 GSM as the lightest "shell" weight.

Can 350 GSM fabric be sublimated?

Yes, if it's 100% polyester or polyester-dominant. However, sublimating 350 GSM requires longer press times (60–90 seconds vs. 45 seconds for lighter fabrics) and higher pressure to ensure dye penetrates the denser fiber structure. The results are excellent — deep, rich color — but production speed is slower per unit.

Do I need insulation with 350 GSM fabric?

For cold-weather applications, yes. 350 GSM on its own provides moderate warmth (similar to a heavy canvas jacket) but it's designed to work as a shell that holds polyester fill, down, or thermal lining. For mild conditions, an unlined 350 GSM jacket works as a wind-breaking layer. For winter, it needs insulation to perform as intended.

Is 350 GSM fabric waterproof?

Not inherently — but 350 GSM is the ideal base for waterproof treatments because the dense weave provides an excellent substrate. We offer DWR (water-repellent), PU coating (waterproof to 5,000mm), and full membrane lamination (waterproof to 10,000mm+) options. The heavier the base fabric, the more durable the waterproof coating performs over time.

What's the difference between 350 GSM plain weave and 350 GSM ripstop?

Plain weave 350 GSM has a uniform, smooth surface — best for sublimation, screen printing, and a clean aesthetic. Ripstop 350 GSM has reinforcing threads woven in a grid pattern (every 5mm) that prevents tears from spreading — best for ski jackets, tactical gear, and any application where tear propagation is a risk. Both are 350 GSM but serve different durability needs.

Can you supply the complete shell system (fabric + insulation + lining)?

Yes — this is one of our most requested services. We supply the 350 GSM shell fabric, polyester fill or down alternative insulation, inner lining fabric, and all treatments (DWR, PU coating) as a bundled package. This simplifies your supply chain, ensures compatibility between layers, and often reduces total cost by 8–12% vs. sourcing each component separately.

How should 350 GSM shell fabric be stored?

Store in a cool, dry place away from direct sunlight (UV degrades all synthetics over time). We vacuum-pack all 350 GSM shipments, which reduces volume by 40–50% and protects from moisture during transit. Once received, keep sealed until ready for cutting. Avoid folding on the same crease line repeatedly — roll instead of fold to prevent permanent crease marks.

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350 GSM Ultra-Heavy Fabric