From COS website: It's hard to overstate the versatility of a classic T-shirt. A cornerstone of the COS collection, this one is crafted from premium organic-cotton jersey and shaped for a neat fit that has slight definition. Style it with tailoring or denim. Regular fit, 220gsm Twin-stitched sleeves Organic cotton is cotton grown without the use of artificial pesticides or fertilizers and contains no genetically modified organisms Shell: 100% Organic cotton. Excluding trims / Machine wash Back length of size S is 21.34”