Since boiled wool is a denser and more windproof material than wool fleece, and therefore has higher insulation capabilities, you can use boiled wool at temperatures as low as -15°C. It is always important to consider the layers of clothing your child wears under the boiled wool jacket or overall. Opt for a layered approach (the "onion look") and ensure that the layers your child wears underneath are made of wool or wool-silk blends whenever possible.
Wool fleece, due to its softer and more breathable surface, is better suited for milder cold temperatures. We recommend not going below -5°C. As with boiled wool, the choice of layers underneath is crucial. Since wool fleece is so soft, it works particularly well as an underlayer beneath windproof jackets or rainwear, providing your child with good freedom of movement.