In the Kuoma online store kuoma.fi:

When you purchase one pair of kids winter boots you get a -20% discount on one item of children's winter clothing. Use discount code: KULOK22OMA. You can take advantage of the discount on children's overalls, winter jackets, winter pants, beanies and collars.

Note that you have to buy boots and clothing at the same time in order to use the discount.

The discount code is valid until 20 November 2022 and can only be used in the Kuoma online store.