This new undersuit from the Polish manufacturer with the anything-but-mundane name, BZ420X, is an improved version of Santi’s BX400X, which is reportedly warmer, “more advanced”, and designed for use in the coldest conditions.
Improvements include upgraded insulation, thicker fleece and a reinforced design that also has a more modern look. The undersuit has two outer pockets and an inner pocket on the chest. The suit is also equipped with reflective tape, rubber loops at the thumbs that allow air to pass into dry gloves, and braces and elastic bands under the feet that prevent the trouser legs from sliding up when putting on the outer suit. Furthermore, the suit is equipped with two specially designed openings for P-valves and suit heating.
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