Single Jersey good tee shirt weight, about 45 inch 115 wide sometimes wider. Weight 170 to 200 gsm. Marls are little heavier. Yarn is combed cotton. - From Sarah -I'm currently sewing some of your cotton jersey - the T Shirt weight- and it's lovely! So soft. All my dressmaking is hand stitched these days, so soft cloth is a must. Anyway I'm really pleased with it, thank you - I washed at 30 degrees and had no shrinkage or colour loss.