Why did Germans cut Jews' hair in concentration camps?

Because the Nazis wanted the Jewish girls to feel helpless and in a lower position, so they buzzed off all their hair.The hair of the Jewish girls and ladies could be used as the stuffing for matresses in German U-boats, so Buzzz, Buzzz, Buzz, they shaved it all off.

Mostly this was done when they entered the camp, so every 2 weeks or so you saw about 10-20 girls from 11-30 completely skinhead and crying quietly.

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The cut hair was indeed used for the war effort, but it was not used to stuff matresses, it was cut and washed, then used to make felt. The felt was used as insulation, as in boots for the winter. Along with hair, several rolls of felt were recovered from Auschwitz.