Lace having variable sections for sports boots and sports boot equipped with such a lace

A sports boot comprising:

• a sole and an upper attached to the sole;
• the upper comprising a frontal portion and an ascending upper portion, the upper portion extending the frontal portion upwardly to cover the lower part of the leg of a user;
• the upper having an opening for the passage of a foot, the opening being demarcated by two lateral frontal quarters for the frontal portion, and two lateral upper quarters for the ascending portion of the upper;
• the upper further comprising:
• a first series of return elements distributed across from each other along each lateral frontal quarter in the frontal portion of the upper;
• and
• a second series of return elements, distributed across from each other along the lateral upper quarter in the ascending portion of the upper;
• a lace extending from the frontal portion up through to the top of the ascending portion of the upper, the lace comprising a first portion that cooperates with the first series of return elements acting by tightening along the frontal quarters and two second end portions that cooperate with the second series of return elements acting by tightening along the upper quarters, the end portions ending in two respective free end parts;
• the first portion of the lace having a smaller cross section than a cross section of each the two second end portions of the lace.

A sports boot comprising:

• a sole and an upper attached to the sole;
• the upper comprising a frontal portion and an ascending upper portion, the upper portion extending the frontal portion upwardly to cover the lower part of the leg of a user;
• the upper having an opening for the passage of a foot, the opening being demarcated by two lateral frontal quarters for the frontal portion, two lateral upper quarters for the ascending portion of the upper, and a tongue between the lateral frontal quarters and between the lateral upper quarters;
• the frontal portion of the upper has a loosened configuration and a tightened configuration, whereby the lateral frontal quarters are closer together in the tightened configuration than in the loosened configuration;
• the upper further comprising:
• a first series of return elements distributed across from each other along each lateral frontal quarter in the frontal portion of the upper, the first series of return elements defining a first connection circuit;
• a second series of return elements distributed across from each other along the lateral upper quarter in the ascending portion of the upper, the second series of return elements defining a second connection circuit;
• a lace extending through pluralities of the first series of return elements and pluralities of the second series of return elements, the lace comprising a central portion that cooperates with the first series of return elements and opposite end portions that cooperate with the second series of return elements, the end portions ending in two respective free end parts;
• the central portion of the lace having an area of smaller cross section than areas of cross section of each the opposite end portions of the lace;
• the central portion of the lace having a length at least equal to a length of the first connection circuit in the loosened configuration of the frontal portion of the upper.