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Ounces Per Square Yard
Measurement — one of 5 in the glossary
The standard weight measure for apparel fabric, quoted on spec sheets as "4.3 oz" or "6.1 oz". Roughly: under 4.5 oz is a lightweight fashion tee, 4.5 to 5.5 oz is a mid-weight everyday tee, and 6 oz and up is a heavyweight built for workwear or long life. Heavier fabric is more opaque, more durable and hides an underbase better, but it is hotter to wear and costs more to ship. Weight alone does not predict feel — check singles and yarn type too, since a fine 30-singles 4.5 oz tee and a coarse 18-singles 4.5 oz tee feel nothing alike.
Weight per area, not per garment
Ounces per square yard measures the fabric, so a 4.3 oz shirt in small and in 3XL are both 4.3 oz. It says nothing about how much fabric is in the garment.
The rough bands: under 4.5 oz is a lightweight fashion tee, 4.5 to 5.5 is a mid-weight everyday tee, and 6 oz and up is heavyweight.
Elsewhere the same thing is quoted in GSM — grams per square metre. Multiply ounces per square yard by roughly 34 to convert.
Why the same weight feels different
Weight is a measure of mass, not of hand. A fine 30-singles 4.5 oz tee and a coarse 18-singles 4.5 oz tee weigh the same and feel nothing alike.
Yarn count, spinning method and knit structure all change the feel at a fixed weight. Ring spun at a given weight is smoother than open end at the same weight.
So weight narrows the field rather than answering the question. Ask for singles and spinning method alongside it.
What weight does predict
Opacity, fairly reliably. A light tee shows what is under it.
Durability and how the garment drapes rather than clings.
And cost to ship, which on a large order is a real number rather than a rounding error.
Common questions
- What does oz mean on a t-shirt?
- Ounces per square yard — the weight of the fabric itself, not the garment. A 4.3 oz shirt is 4.3 oz in every size.
- What is a good weight for a t-shirt?
- Under 4.5 oz is a lightweight fashion tee, 4.5 to 5.5 is a mid-weight everyday shirt, and 6 oz and above is heavyweight. Which is good depends entirely on the job.
- How do you convert oz per square yard to GSM?
- Multiply by about 34. A 4.5 oz fabric is roughly 153 GSM; a 6 oz fabric is roughly 203.
- Does a heavier t-shirt mean better quality?
- No. Weight predicts opacity and durability, not hand. A fine lightweight ring spun tee can feel far better than a coarse heavy one.
Where this comes up
See also
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