









- Home
- waterproof boots
- Kollen Modular Winter Boots
Product Hero

Product Description
Better together. Built for real winter.
Winter doesnât stay the same all day. Thatâs why Kollen is built to adapt.
Designed with winter expert Tiril Eckhoff, this waterproof boot combines warm materials, a grippy outsole, and a removable shaft that gives you two levels of protection. On cold, snowy days, wear the shaft for full coverage and warmth. When the weather eases, take it off and use Kollen as a warm, waterproof everyday boot.
Each part is made to support the other. The Merino wool lining keeps your feet dry and comfortable. The outsole gives confident traction when the ground gets slick. And the modular design lets you get more from one pairâmore warmth when you need it, less bulk when you donât.
A boot designed in Norway. Made to make winter simpler, warmer, and easier to handle.
Innovations
Nature Lab is our initiative to research, test and develop shoes in a more sustainable way. This shoe uses the following innovations:
#1 â Modularity
At Kastel, we believe one shoe can do more. By designing modular componentsâlike the removable shaft on Kollenâwe make shoes that adapt to your needs. Add warmth and coverage when needed. Remove it when you donât. This is just the beginning of how weâre rethinking footwear to extend use, reduce waste, and keep you comfortable through it all.
Learn more#2 â Size Insert
These shoes come with a size insert, designed to improve fit and reduce returns. Offering half sizes helps, but it also creates stock and production challenges. Instead, we developed a size insert that adjusts the fit by half a size, ensuring a better fit without extra production. If a shoe feels slightly off, this simple solution makes it just right.
Learn more






