Men's Nordic midlayers

That depends on the jacket, weather and effort. At a fast pace, a base layer under a suitable wind jacket can be enough. Colder conditions or gentler skiing may call for an extra layer that is easy to ventilate.

That can work in dry calm conditions. Ordinary fleece lets air through; wind or open terrain calls for a wind layer over it. Compare whether your model includes its own wind protection at the front.

Too many warm layers may retain more heat than training needs. Open the zip early and adjust layers for your effort. A backpack reduces moisture transfer compared with exposed fabric, so consider that when planning warmth.

Wear the intended base layer and reach forwards and upwards as if using poles. Sleeves should cover your wrists without bunching under the jacket. Check that your back and shoulders still move freely at the same time.