Lower shell for a gliding boot

A ski boot, comprising:

• a lower shell intended to receive a user's foot, the lower shell comprising an enveloping part having a general shape hugging a shape of the user's foot, the enveloping part comprising a rear wall hugging a shape of a heel of the user's foot,
• a collar intended to envelop a lower leg of the user, the collar being articulated in rotation about the lower shell,
• an upwardly extending tongue at a rear of the gliding boot, and
• an elastic means,
• wherein
• a first end of the tongue forms a fastened assembly or a monobloc assembly with the lower shell,
• the tongue extends substantially parallel to the rear wall, a space being defined between the tongue and the rear wall, and
• a second end of the tongue is connected to the collar via the elastic means.