Viking designed their Radiantex boot liners to fit all their rubber boots. They are a polypropylene and wool blend, providing protection against temperatures as cold as -30°C. They have a metallised membrane, which retains heat and allows moisture to escape. A front elastic holds the lining in position, preventing it from moving.
Seams on the sole are kept to the outside, reducing the chance of uncomfortable chafing. The boot has zigzag sewing for extra strength and a vinyl heel protector. It is available in sizes 7-15.