GSM (grams per square metre) is the single most important number when ordering t-shirts. This guide explains what different GSM ranges mean for feel, durability, and end use — from lightweight 140 GSM summer tees to heavyweight 240 GSM premium retail t-shirts.
GSM — grams per square metre — is the most important specification when ordering t-shirts. It determines the fabric weight, feel, durability, and suitability for different end uses. Here is the complete guide to understanding GSM for t-shirt buyers.
GSM measures the weight of fabric per square metre. A higher GSM means heavier, thicker fabric. A lower GSM means lighter, thinner fabric. GSM is measured using a GSM cutter (a circular cutter that cuts a precise area of fabric) and a precision scale. The weight of the cut sample is multiplied to calculate GSM.
120–150 GSM: Very lightweight. Used for promotional t-shirts, summer tees, and inner layers. Feels thin and slightly see-through. Not suitable for premium retail. 150–170 GSM: Lightweight. Standard for promotional and budget retail t-shirts. Comfortable for hot climates. 170–190 GSM: Medium weight. The most popular range for standard retail t-shirts. Good balance of comfort, durability, and cost. 190–210 GSM: Medium-heavy. Premium retail and private label brands. Better drape, more opaque, longer-lasting. 210–240 GSM: Heavyweight. Premium fashion brands, oversized t-shirts, streetwear. Excellent structure and durability. 240+ GSM: Very heavyweight. Ultra-premium streetwear, vintage-style tees. Exceptional quality and feel.
When placing an order, specify the GSM range you require (e.g., 180–200 GSM). Manufacturers will select fabric within this range. For critical applications, you can request a specific GSM (e.g., exactly 190 GSM) with a tolerance of ±5 GSM.
The same GSM can feel different depending on the fabric type. 180 GSM combed cotton feels softer and more premium than 180 GSM ring-spun cotton. 180 GSM CVC (cotton-polyester blend) feels slightly stiffer than 180 GSM 100% cotton. Always request a fabric swatch before ordering to verify the hand feel.
You can measure GSM using a GSM cutter (available on Amazon for $15–30) and a precision scale. Cut 5 samples from different areas of the fabric, weigh each sample, and calculate the average. Multiply by 100 (for a 10cm diameter cutter) to get GSM.
Understanding GSM is essential for ordering the right t-shirt for your brand. Esplandea Incorporation produces t-shirts from 140 GSM to 280 GSM in a wide range of fabric types. Contact us for fabric swatches and a free quote.