The Siena Roubaix Knickers are named after the Thermo Roubaix fabric used in their construction.
Thermo Roubaix is made up of hollow core fibers, which effectively maximizes the surface area of the material.
This increases the material's wicking properties and creates countless micro pockets of trapped air to act as insulation — basically the same principle that makes Merino wool such a quality insulator.
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