Brittney Griner's signature locks are no more ... and, according to her attorney, it's all 'cause Russian prison temperatures were causing brutal hair freezing.
Maria Blagovolina, who repped the WNBA star in her trial in Russia, told ESPN on Thursday the 32-year-old got the haircut two Sundays ago ... after her 'do kept freezing following prison showers.
Blagovolina said rather than deal with the issue for an entire Russian winter, Griner elected to chop it all off.
"It's very cold in there and every time she washed her hair she got cold and would get a chill," Blagovolina said.