The guiding principle is practicality and layering. A water-resistant, windproof outer layer and comfortable walking shoes are essential at any time of year.
In winter, pack a warm coat, snow trousers and proper boots with thick soles and good grip. For young children, an all-in-one overall is often the easiest option. Natural base layers – mulesing-free merino wool, bamboo or silk – work well, as do technical fabrics. Don't forget mittens, balaclavas and hats. A note on ski clothing: in popular winter destinations, you can often rent gear for children and adults, which saves significantly on luggage.
If you’re buying winter clothing for the first time, it’s safest to choose brands designed for Nordic conditions. A local tip: the Finnish brand Reima makes great outerwear for kids for all four seasons.
One often-overlooked accessory is a reflector (heijastin). Finnish autumn and winter evenings are dark, and visibility is important, especially if you are walking in darker country roads. You can buy reflectors almost anywhere in Finland, and children's reflectors are often cheerfully colourful and have fun shapes.
For summer, pack light layers and something warmer for cooler evenings. Long sleeves and trousers are useful when exploring nature – they offer some protection against ticks. Don't forget sunglasses and sunscreen; snow is surprisingly bright in spring, and the mild summer temperatures can be deceptive for UV exposure.
Finally, always pack swimsuits for the whole family. Sauna is central to Finnish life, and you will want to take part – whether it's a lakeside sauna in summer or a spa sauna in winter.