There are two fabric weights across the range. GSM is grams per square metre: the weight of the cloth itself, not of the finished garment.
260GSM cotton
The raw hem t-shirt and the long sleeve tee. 100% cotton, garment-dyed, with the hem left unfinished. Midweight jersey with enough body to hold an oversized cut instead of clinging to it.
380GSM brushed fleece
The hoodies, the crewneck and the sweatpants. 100% cotton, brushed on the inside face. At roughly 46 percent heavier than the jersey, it behaves differently: it holds a shape rather than draping, which is why the fleece pieces read boxier.
Which weight is on which piece
260GSM: raw hem t-shirt, raw hem long sleeve tee.
380GSM: brushed fleece hoodie, snap collar hoodie, full-zip hoodie, fleece-lined crewneck, fleece sweatpants.
Both weights are 100 percent cotton. Wash cold and dry low. Full detail is on the care page.