Kivity Play t-shirts size guide featuring four children wearing different sizes: Size 6 for 119cm/20kg, Size 8 for 123cm/23kg, Size 10 for 136cm/26kg, and Size 12 for 142cm/28kg. Size chart includes dimensions in cm for sizes 4 to 12: total length, shoulder width, chest, and sleeve length. Available in white and blue colors.