Why are all the hats of armored soldiers one by one?

The tank is bumpy when it is off-road, and there are too many iron blocks and hard objects in the tank mine. Hats are anti-collision, and everything you see is rubber strip or hard sponge strips. Such a strip-by-strip design can not only prevent collision well, but also maintain the breathability and portability of the hat, and also facilitate the installation of communication equipment. However, modern tank fighters in the United States and Germany generally use light helmet-mounted anti-collision/communication caps because of the large internal space of tanks. This kind of strip anti-collision cap is widely used in armored forces using Soviet tanks, and the anti-collision effect is also very good. German tank soldiers still had tank caps before 1940, but I don't know whose idea it was. From this year on, they changed the original tank cap into a ship cap (in fact, German tank soldiers also had hard-leather anti-collision caps during World War II, and some German tanks used staggered load wheels, which had better shock absorption effect). Of course, bumps are inevitable. It is said that there is a popular joke among Soviet tank soldiers, saying that the first thing for German tank soldiers to do when they get off the train every day is to count how many bags are on each other's heads, and the least one of them is to treat them.