Matt by Cuisse de Grenouille: a long-sleeved organic cotton tee for cooler days
A long-sleeved take on a brand's classic tee, made from 240 g/m² organic cotton and stitched in Portugal — built, the brand says, to see you through winter.
What it is
Matt is a long-sleeved t-shirt from Cuisse de Grenouille, a French label started by two brothers, Séverin and Lucas, who began by making swimwear inspired by their surf trips before branching out into everyday clothing. The brand’s range now includes t-shirts in organic cotton made in Portugal, and Matt sits on that side of the catalogue: a plain, long-sleeved tee meant to work as a base layer or on its own once the temperature drops.
It comes in seven colourways — white, washed black, washed orange, navy, light grey, washed sage green and washed sky blue — and spans sizes from XXS to XXL. That’s a wide enough range to suit most builds, and the washed finishes suggest a deliberately lived-in look rather than a crisp, brand-new sheen.
Who is it for? Anyone who already likes a simple cotton tee and wants a warmer, long-sleeved version for the colder months, as a layer under a jacket or as a stand-alone top.
Why it exists
According to the brand, Matt was designed to offer the same feel as its short-sleeved sibling, Marlon, but with sleeves added for the colder months. The idea, as the brand explains it, is straightforward: rather than reaching for a jumper as soon as the weather turns, you get a tee substantial enough to be worn on its own for more of the year, or layered without adding bulk.
The brand states that the cut is meant to let you get through winter and stay warm — a claim tied directly to the fabric weight and construction rather than to any special thermal technology. In other words, this isn’t presented as technical winter wear; it’s a heavier, longer-sleeved cotton tee built to extend the season in which a simple t-shirt still makes sense.
What matters
The fabric weighs 240 g/m², which is on the heavier side for a cotton t-shirt. In practice, that density is what should give Matt more structure and warmth than a typical lightweight summer tee — it’s the main reason the brand can claim it works as a stand-alone layer into the cooler months rather than just an undershirt.
The cotton is GOTS-certified, to the Global Organic Textile Standard. That certification covers both the organic status of the cotton fibre and a set of environmental and social criteria through processing. For a buyer, it’s a way to verify the “organic cotton” claim rather than take it on trust — the certification is issued by an independent body, not just a label the brand applies itself.
Manufacturing takes place in Portugal, in what the brand describes as family-run workshops. That’s a relatively short supply chain within Europe, and it typically allows for closer oversight of how a garment is actually made compared with production spread across multiple distant sites.
The sleeves are cut in a raglan style, meaning the sleeve panel runs in one piece up to the collar rather than being set in at a shoulder seam. Raglan construction generally allows more freedom of movement in the shoulder and a slightly more relaxed fit through that area — relevant if the tee is going to be worn under a jacket or moved around in during the day.
The range of seven colours and seven sizes (XXS to XXL) matters less for the garment’s performance and more for practicality: it widens the chance of finding both a shade and a fit that work, whether you want a plain white or navy base layer or one of the washed, slightly faded tones.
Day to day
Matt is worn like any long-sleeved t-shirt: on its own in milder weather, or underneath a jumper, shirt or jacket once it gets colder. Its raglan sleeves and cotton construction point to a garment meant for regular, everyday wear rather than a specific activity or sport.
The fabric is certified organic cotton, which typically points to natural fibre care (moderate wash temperatures, avoiding harsh treatment) as a sensible default.
Storage and handling are the same as for any cotton t-shirt: fold or hang, keep out of direct prolonged sunlight if you want the colour to last, and treat the washed colourways as already showing their intended faded finish rather than a sign of wear.
Technical specifications
| Characteristic | Value |
|---|---|
| Fabric weight | 240 g/m², GOTS-certified organic cotton |
| Country of manufacture | Portugal, family-run workshops |
| Sleeve construction | Raglan sleeves |
| Product reference | MATT.02-XXS |
| EAN/UPC code | 3700729981280 |
What the brand says
Cuisse de Grenouille positions Matt as the long-sleeved counterpart to its Marlon t-shirt, stating that it offers the same thickness, comfort and style, with sleeves added. The brand also says the cut of the tee is designed to let the wearer get through winter while staying warm.
On the question of fit, the brand states that Matt shares its cut with the Marlon t-shirt, and claims that this cut has already been validated by more than 10,000 customers — a figure offered by the brand itself as a track record for the pattern, rather than an independently verified count.
Why it caught our eye
We like that the organic cotton claim is backed by an actual GOTS certification rather than left as a marketing word. We also appreciate that Matt is presented plainly as a heavier, long-sleeved version of an existing tee, made in Portugal, without overselling it as technical winter gear. It's a straightforward proposition, and that clarity is refreshing.
Exactly the kind of brand we’d love to come across on O!deal one day.
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