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WENGEN, SWITZERLAND - JANUARY 12: Bode Miller, of the USA, talks to the media after his second day of training for the Wengen FIS World Cup Downhill race on January 12, 2006 in Wengen, Switzerland. Miller apologized for his comments during a television interview on drinking alcohol and competing. (Photo by Shaun Botterill/Getty Images)
The signed helmet was worn by Miller in the Feb. 27 slalom.
He skied out 8 seconds into the race. Warman, who was diagnosed with cancer seven weeks ago following a routine mammogram, calls Miller an "extremely generous guy."
She said the auction was arranged by her friend Jake Zamansky, also a member of the U.S. Ski Team. Zamansky said items from other Olympians also will be auctioned to help Warman.
Bids for Miller's helmet close Wednesday night.