Last year, it was the red cap that stood out in Helsinki winter street style. This year a knit beanie, preferably with a fur pom pom on top, has seemed like a popular choice for the ladies:

Six knit beanie hats in monochrome black and white

1.Beechfield Faux Fur Pom Pom Winter Beanie 2. Annabelle Fur Pom Pom Knit Hat via Intermix 3. Tarnish Chunky Knit Beanie 4. Crosshatch Knit Beanie via Moorea Seal 5. Inverni Cashmere and Fox Fur Cap 6. Nike Fur Pom Pom