The present invention provides a helmet (1) comprising: two layers (2, 3) configured to slide with respect to each other; and wherein the surface of one or both layers
The magic number is 422 grams. Four hundred & twenty-two grams. That's less than a pound (0.93 lbs), and that's on my scale at home, not a figure that ABUS provided. Actually, and at odds with convention in the helmet market, that number is well below the claimed weight of 440 ...