We've recently un-earthed a box in our warehouse that we'd forgotten about! These well-made kids t-shirts are from the Polar Granfondo La Mussara that is held every year in Spain.
As is usual with all Santini garments, the sizing is European and the armpit to armpit measurements for the t-shirts are as follows so that you can compare them to an exiting garment.
2/3 Years: 38cm
4/5 Years: 40cm
8/9 Years: 44cm