The yarn in this top is a mix of wool and linen. Even if it has short sleeves, it gives a lot of warmth, and therefore will suit a Norwegian summer night very well.
The top is knit bottom up in the round. It is fitted at the waist. The sleeves are knit together with the body, and the yoke has raglan decreases.
The pattern is available on Ravelry: https://www.ravelry.com/patterns/library/29-oslo-top