GSM Fabric Weight Guide: Everything You Need to Know

When sourcing custom clothing, you'll constantly encounter the term 'GSM'. Understanding GSM is fundamental to specifying quality clothing and having productive conversations with manufacturers.

What is GSM?

GSM stands for Grams per Square Meter. It measures how much one square meter of a fabric weighs in grams. It is the universal standard for measuring fabric weight and thickness.

**Why GSM matters:**

How to Measure GSM

Manufacturers use a GSM cutter — a circular device that cuts a precise 100 cm² sample — which is then weighed on a precision scale and multiplied by 100.

You can request GSM test reports from manufacturers. Reputable factories test every fabric lot before cutting.

GSM Guide by Garment Type

T-Shirts

| GSM | Weight Type | Feel | Best For |

|-----|-------------|------|----------|

| 120-150 | Ultralight | Sheer, lightweight | Summer, tropical |

| 160-180 | Standard | Everyday feel | Basic t-shirts, promotional |

| 180-200 | Mid-heavy | Substantial | Premium basics |

| 200-220 | Heavy | Thick, structured | Streetwear, luxury basics |

| 220-280 | Heavyweight | Very thick | Ultra-premium streetwear |

Hoodies & Sweatshirts

| GSM | Weight Type | Best For |

|-----|-------------|----------|

| 240-260 | Light fleece | Summer hoodies, layering pieces |

| 280-300 | Standard | Everyday hoodies |

| 320-360 | Heavy | Premium hoodies, streetwear |

| 380-420 | Extra heavy | Luxury streetwear, boxy fit |

| 450-500 | Ultra heavy | Ultra-premium, specialty brands |

Leggings & Sportswear

| GSM | Weight Type | Best For |

|-----|-------------|----------|

| 150-180 | Light | Summer, layering |

| 180-220 | Standard | All-around performance |

| 220-260 | Medium-heavy | Compression, cold weather |

| 260-300 | Heavy | High-compression, winter |

Performance Jerseys

| GSM | Application |

|-----|-------------|

| 120-140 | Summer soccer/basketball jerseys |

| 140-160 | Standard performance tops |

| 160-180 | Heavy performance jerseys |

Common GSM Misrepresentations

Some manufacturers report inflated GSM. Ways to protect yourself:

1. Request a lab-tested GSM report with each production run

2. Order samples and conduct a basic hand-feel comparison

3. Send samples to a third-party testing lab (Intertek, SGS, Bureau Veritas)

4. Specify GSM tolerance in your purchase order (e.g., 320 GSM ±10 GSM)

GSM and Price Relationship

For the same fabric type and composition:

Specifying GSM in Your Tech Pack

Always include GSM in your fabric specification:

❌ 'Heavy cotton fleece for hoodie'

✅ '320 GSM ±15 GSM, 80% cotton 20% polyester, brushed fleece back, ring-spun yarn'

The more specific your specification, the more accurately the manufacturer can quote and produce to your standard.

Contact Mughal Apparel to discuss fabric specifications for your collection. We provide fabric GSM test reports for all bulk orders.