The 22 year old Swiss national was filming in Le Portalet in the canton of Valais (Switzerland) when the couloir she was snowboarding avalanched.
The Freeride Wold Tour said in a statement today:
"The Freeride community has experienced a tremendous loss today as we learned that one of the most hopeful young talents and current snowboard World Champion, Estelle Balet, has tragically passed away in an avalanche. The mortal avalanche occurred earlier this morning in the canton of Valais. Estelle Balet was a naturally gifted shining star and demonstrated remarkable talent as she quickly became a household name on the Freeride World Tour, bringing home her second title as World Champion just a few weeks ago in Verbier. Our thoughts are with the family and friends of Estelle Balet as we send our deepest sympathy and condolences during this very difficult time".