The size is M. This is pet clothing for dogs and cats. It's for the autumn and winter seasons. It's thick, so it's recommended for cold weather protection. *When selecting a size, please choose a size that is 2-3cm larger than your dog's measurements. (Material) Cotton Sizes: [S size] Chest 31cm, Back Length 20cm, Recommended Weight 1kg - 1.5kg [M size] Chest 36cm, Back Length 25cm, Recommended Weight 1.5kg - 2.5kg [L size] Chest 41cm, Back Length 29cm, Recommended Weight 2.5kg - 3.5kg [XL size] Chest 45cm, Back Length 34cm, Recommended Weight 3.5kg - 4.5kg Dog clothes, dog wear, tank top, sleeveless, cut and sew, thick, for dogs, dog, for pets, prevents hair loss, loungewear [Notes] *The colors in the photos may look different from the actual product. *Due to amateur inspection, there may be overlooked small scratches or stains. Returns due to incorrect size selection are not accepted. Please purchase with the above in mind.