Sports boot with variable rigidity

A sport boot, including a boot for a gliding sport, said boot comprising:

• an external upper and an independent internal liner positioned within said external upper, said external upper comprising at least first, second, and third portions;
• said first portion being rigid and substantially non-flexible, said first portion including a sole and at least one heel stiffener extending upwardly from said sole, said second portion comprising a vamp, and said third portion comprising a saddle;
• said vamp being attached to said first portion, said vamp being more rigid than said heel stiffener and more flexible than said saddle;
• said saddle being flexible and being connected to and extending transversely from at least parts of said vamp, said saddle extending over a forefoot of a wearer;
• said external upper further comprising a device for tightening the boot on a forefoot of the wearer.

A sport boot comprising:

• a rigid sole, an external upper, and an independent internal liner;
• said external upper comprising:
• a rigid portion comprising a heel stiffener, said heel stiffener having transversely opposed sides extending upwardly along opposite sides of a heel of a wearer;
• a vamp connected to and extending upwardly from a forward part of said rigid portion, said vamp having transversely opposed sides extending forwardly from said transversely opposed sides of said heel stiffener;
• a saddle extending transversely from said transversely opposed sides of said vamp to be positioned above a foot of a wearer;
• said vamp being more flexible than said heel stiffener and more rigid than said saddle.