A 220gsm t-shirt is a heavyweight tee, and the weight is doing three specific jobs: it stays opaque instead of turning translucent across the shoulders, it holds its shape instead of sagging at the neck after a hot wash, and it hangs off the body rather than clinging to it. Most high street tees sit around 140gsm to 160gsm, which is why they lose their shape by the third wear. The catch is that almost every heavyweight tee sold in the UK is cut boxy and oversized. It does not have to be.
What does GSM actually mean on a t-shirt?
GSM stands for grams per square metre. It is simply how much a metre of the fabric weighs, and it is the single most useful number on a t-shirt spec because it tells you how the shirt will behave after it has been washed a dozen times.
Fabric weight is not a style choice. It sets opacity, shape retention and how the fabric falls. Here is the rough map most menswear buyers work to.
| Weight | What it feels like | What it does over time |
|---|---|---|
| 140 to 160gsm | Thin, papery, fast fashion standard | Goes see through, collar loses its snap early |
| 180 to 200gsm | Mid weight, everyday | Holds up reasonably, still fairly soft on the body |
| 220 to 250gsm | Substantial in the hand, dense knit | Stays opaque, keeps its neckline, drapes rather than clings |
| 280gsm and up | Very heavy, close to sweatshirt jersey | Durable, but warm for a British summer and slow to dry |
For June to August in the UK, 220gsm is the useful middle. Heavy enough to look considered under a light overshirt in the evening, not so heavy that it becomes a jumper by two in the afternoon.
Why does a heavier tee hold its shape better?
Two reasons, and both are structural rather than marketing.
The first is knit density. More yarn per square metre means less space between the loops, so the fabric has less room to stretch out of true when it is wet and warm. Thin jersey has nowhere to go but sideways, which is why a cheap tee widens at the hem and droops at the collar.
The second is fibre length. Supima is an extra long staple cotton, so each fibre runs further through the yarn with fewer loose ends. Fewer ends means less pilling and a smoother surface that does not go fuzzy across the chest and under the arms. Add a small percentage of elastane and the fabric recovers to its own shape instead of holding the shape of whoever last stretched it.
95% Supima cotton with 5% elastane, raglan sleeve, slim fit, machine washable. Resists pilling and holds its shape.
Does a heavyweight t-shirt have to be boxy?
No, and this is where most of the category goes wrong for anyone who wants a clean line. Heavyweight cotton arrived in the UK through streetwear, so the default cut that came with it is wide, cropped and deliberately oversized. That silhouette suits a certain look. It does not suit a man in his thirties or forties who wants a t-shirt he can wear under a jacket to dinner.
The fabric weight and the cut are separate decisions. You can take 220gsm and cut it slim, which is exactly what the Classico does. The other detail worth knowing is the raglan sleeve: instead of a seam that rings the shoulder, the sleeve runs diagonally up to the collar, tracing the natural fall of the shoulder. It removes the hard horizontal line that a set in sleeve puts across the top of the arm, so the shoulder reads as a slope rather than a step. On a heavier fabric that difference is visible from across a room.
What should you check before buying a heavyweight tee?
- The GSM is stated. If a brand does not publish the fabric weight, there is usually a reason. Anything above 200gsm should be advertised.
- The composition, not just the weight. Heavy polyester is heavy and still feels like plastic. Look for long staple cotton, with a small amount of elastane if you want recovery.
- The collar rib. A dense, deep rib is what stops the neckline going wavy. It is the first thing to fail on a cheap tee.
- The cut is described separately from the weight. Slim, regular and oversized are choices. Do not accept boxy as the price of buying heavy.
- Care instructions. Machine washable matters more than it sounds. A tee you have to think about is a tee you stop wearing.
Classico or Roma: which tee suits which day?
Two different jobs, two different fabrics.
| The Classico Tee | The Roma Tee | |
|---|---|---|
| Fabric | 95% Supima cotton, 5% elastane | 100% cotton |
| Weight | 220gsm | 200gsm |
| Detail | Raglan sleeve, plain | Signature collar, multi stripe, elasticated arms |
| Cut | Slim fit | Tailored, neat through arms and torso |
| Best for | The tee you wear every week, under a jacket or alone | When you want the shirt to be the detail. Limited run of 75 |
| Price | $84 AUD | $74 AUD |
200gsm cotton, ribbed collar, elasticated arms and a tailored line through the torso.
What do you wear a heavyweight tee with?
The reason a heavy tee earns its place in a British summer wardrobe is that it works with tailoring in a way a thin one never does. A 220gsm tee under an unstructured jacket sits flat instead of rucking at the shoulder, and it does not telegraph every seam of what is underneath.
The straightforward pairing is a tee and a tapered chino. The Luxe Chino is cut with a modern tapered leg and a clean line from waist to ankle, in stretch twill that recovers after every wash, so the silhouette stays consistent from morning to evening. Stone or grey in summer, navy or black when the weather turns. Trainers for the day, loafers for the evening, and the outfit has done its work.
A tailored fit with a clean silhouette from waist to ankle. The stretch is built into the fabric and recovers after every wash.
Frequently asked questions
Is 220gsm too heavy for summer?
No. 220gsm is a heavyweight tee, not a sweatshirt. The jump in warmth happens closer to 280gsm and above. At 220gsm the fabric holds its shape and stays opaque while still being a single layer of cotton jersey, which is why it works through a UK summer and then again under a jacket in autumn.
Do heavyweight t-shirts shrink?
Dense cotton is more stable than thin jersey, so movement is smaller. The bigger risk is heat. Wash cool and skip the tumble dryer and a 220gsm tee will keep its length. The Classico is machine washable and blended with elastane, which helps it recover its shape rather than settle into a new one.
What is Supima cotton and is it worth paying for?
Supima is a trademarked extra long staple cotton grown in the United States. Longer fibres make a smoother, stronger yarn with fewer loose ends, so the fabric resists pilling and keeps its surface after repeated washing. On a t-shirt you notice it most at month six, not on day one.
What is a raglan sleeve and why use it on a t-shirt?
A raglan sleeve runs diagonally from the underarm to the collar rather than joining at a seam around the shoulder. It follows the natural line of the shoulder, gives more freedom of movement through the arm, and avoids the hard horizontal seam that can make a heavier tee look blocky.
Does Guillo ship to the UK?
Yes. Guillo ships worldwide from Australia. Prices on site are in AUD.
Is it cheaper to buy two tees?
Yes. Any two tees are $9 off each, so two Classicos come to $150 AUD and two of the $74 tees come to $130 AUD. At three pieces or more, anything in the range is 20% off, which beats every pairing.
The weight, without the boxy cut
220gsm Supima cotton, raglan shoulder, cut slim. Two tees priced as one pair, or 20% off any three pieces.
Shop the tees →Ships worldwide. Prices in AUD.
Guillo.
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