Home kit design for Dutch Eredivisie-club sc Heerenveen.
The shirt is modelled after the Frisian flag (more info here: https://en.wikipedia.org/wiki/Flag_of_Friesland)
On the back of the neck is an 1920 text (founding year of the club).
Shirt sponsor is German brand JAKO, whose logo is on the right chest and the back. Their trademark 'dots' are on the shoulders.
Main sponsor is Kika, an organisation for childcancer-research.