FIELD GUIDE · GEAR, EXPLAINED · NO. 01
GSM stands for grams per square meter, and it is simply how much a square meter of fabric weighs. A 200gsm tee is light and drapey. A 500gsm hoodie is dense and substantial. That one number tells you more about how a garment will feel, hang, and last than almost anything else on a product page, and most brands never explain it.
LLRULE is a California coastal apparel brand built around garment-dyed, broken-in essentials, and we publish our fabric weights on purpose. This guide translates the numbers into what your hands and shoulders actually feel.
What does GSM actually tell you?
Three things. First, substance: how much fabric is physically on your body. Second, drape: lighter fabrics flow and layer; heavier fabrics hold a silhouette and resist bagging out. Third, climate range: weight is the biggest factor in how warm a cotton piece wears.
What GSM does not tell you is quality. A heavy fabric made from short, weak fibers still pills and sags. Weight plus fiber is the full picture, which is why we pair our heavier weights with organic and ring-spun cotton that holds up to the number.
The LLRULE weight ladder, lightest to heaviest
The Ladder
~200gsm (6 oz) — the Supima Essentials Tee. Everyday tee weight: light enough for all day, substantial enough to hold its drape and never go see-through.
240gsm (8 oz) — the Sprint Heavyweight Organic Tee. The heavyweight-tee class: structure without stiffness, an almost sueded hand.
330gsm — the Form Organic French Terry Crew. The midweight sweet spot: enough weight to hold its shape, light enough to wear ten months a year.
400gsm — the Form Organic Brushed Hood. True heavyweight territory: brushed interior, stands in for a jacket on most coastal days.
500gsm — the Pulse Hood, Pulse Pant, and Form Quarter Zip. The top of the ladder: dense, looped French terry that holds warmth without trapping it, with drape that falls clean and stays that way.
How do you choose a weight?
Choose by the day you are dressing for, not by the idea that heavier is better. Under 250gsm is tee territory: layering, warm days, movement. Around 300 to 350gsm is the do-everything zone: the crew you wear over a tee from fall through spring. At 400gsm and above you are buying warmth and structure: pieces that replace a light jacket and read substantial the second you pick them up.
One honest note on weight and heat: a 500gsm hoodie in a July heat wave is the wrong tool, no matter how good it feels in October. Match the number to your climate. On the coast, where mornings start at 50 and afternoons hit 75, the ladder earns its range.
Two rungs of the ladder: the 330gsm Form Crew and the 6 oz Supima Essentials Tee. Tap either to shop it.
Why does fabric weight affect durability?
More fiber per square meter means more material to absorb wear before the garment thins, bags, or goes translucent. It is why heavyweight tees survive years of rotation while featherweight ones die in a season, and why our 330 to 500gsm pieces are pre-shrunk and built to be washed often: the weight carries the wash test. Pair that with the garment-dye process from the Wash Story and you get pieces that improve with the machine instead of losing to it.
What standards stand behind these fabrics?
We keep our supply chain private on purpose; those relationships took years to build, and they stay ours. What we will tell you is the standard of the houses we work with. The major manufacturing partners behind our organic fabrics hold the certifications that matter: GOTS, the Global Organic Textile Standard, which verifies organic status from the farm to the finished garment; OEKO-TEX Standard 100, which means no toxic dyes, chemicals, or formaldehyde anywhere in the process, down to the zipper coatings; and social-accountability certifications including SA8000, Fairtrade, and WRAP, which guarantee safe conditions, fair wages, and humane manufacturing for the people doing the work. No sweatshops. Ever.
The same partners spin American-grown Supima on fully licensed supply chains, gin extra-long-staple cotton on slow roller gins that protect fiber length instead of tearing it, and run wind-powered production facilities. Organic from soil to stitch, ethical from farm to factory: people, animals, and the planet accounted for at every stage. That is the bar a fabric has to clear before it earns the LLRULE label.
Build the ladder into your rotation: a Supima tee underneath, a 330gsm Form Crew for most days, and 500g Pulse for the cold ones. Three weights cover the whole year.
QUESTIONS, ANSWERED
What is a good GSM for a hoodie?
300 to 400gsm covers most people most of the year. Go 450gsm and up if you want a hoodie that works as an outer layer in real cold.
Is higher GSM always better?
No. Higher GSM means more warmth and structure, not more quality. Fiber quality and construction decide whether any weight lasts.
What counts as lightweight, midweight, and heavyweight?
For cotton tops: under 250gsm is lightweight, 250 to 400gsm is midweight, and 400gsm and above is heavyweight.
How do ounces convert to GSM?
Multiply ounces per square yard by about 34. A 6 oz tee is roughly 200gsm; an 8 oz tee is roughly 270gsm by fabric measure, though brands sometimes quote finished-garment weight instead.
Are LLRULE organic fabrics actually certified?
Yes. The manufacturing partners behind our organic programs hold GOTS, OEKO-TEX Standard 100, and leading social-accountability certifications including SA8000, Fairtrade, and WRAP. We keep their names private; the certifications do the talking.
The number on the page is the feel in your hands. Now you can read it.
