Real sailors!

I initially purchased as a single cap nod to my son, who had been offered a boat license. Bonnet immediately busy with my little 7 year old son. Considering the price I recommended 4 cups of different colors for my grandchildren. They are thrilled (I do not have the opinion of the latter that does not have a years!). The cups are fixed on their head to go to school.
One small problem, one size, easy to choose, but not to lend to "big heads" to prevent them expand!