Footwear upper

1. A footwear upper comprising:

a front portion configured to cover an upper part of a foot;

an intermediate portion corresponding to an insole configured to support a lower part of the foot; and

a rear portion configured to cover a heel of the foot,

wherein:

each of the front portion, the intermediate portion and the rear portion is made of an engineered fabric composed of an internal core and a pair of external layers made of knitted fabric;

the front portion, the intermediate portion and the rear portion have different thicknesses resulting from use of different yarns, in addition to different processing methods;

the footwear upper is made as one piece, pre-shaped and ready to be applied to a sole;

a part of the front portion has a trapezoidal configuration and the front portion includes:

a first zone which is in contact with the intermediate portion and corresponds to a toe zone of the foot;

a second zone configured to cover the upper part of the foot; and

a third zone, which corresponds to a tip of a tongue to help a user to don the footwear upper,

wherein the first zone, the second zone and the third zone are formed differently.

2. The footwear upper according to claim 1 , wherein the third zone of the front portion has a variable thickness and a padding.

3. The footwear upper according to claim 1 , wherein:

the intermediate portion connects the front portion and the rear portion and a part of the intermediate portion has a rectangular, contoured configuration;

the intermediate portion includes a first zone corresponding to the sole, a second zone corresponding to an instep, and a third zone corresponding to the heel;

the first zone of the intermediate portion includes a first sector corresponding to a reinforced support for a forefoot and a second sector with perforations;

the first zone of the intermediate portion is thicker between the perforated parts;

the second zone of the intermediate portion includes a perforated sector in correspondence with the instep; and

the third zone of the intermediate portion has a reinforced sector corresponding to a resting area for the heel.

4. The footwear upper according to claim 1 , wherein:

the rear portion has a band configuration configured to laterally wrap the heel;

a free end of the rear portion includes a pair of tabs configured to wrap the heel with a free space therebetween for leaving an Achilles tendon free; and

the rear portion is composed of a fabric with variable thickness padding.

5. The footwear upper according to claim 3 , wherein:

lateral edges of the front portion are configured to respectively couple with lateral edges of the second zone of the intermediate portion; and

front edges of the front portion are configured to respectively join with edges of the first zone of the intermediate portion.

6. The footwear upper according to claim 1 , wherein:

yarn of the internal core serves as a cavity and a connection between the pair of external layers;

the yarn of the internal core is zigzagged and engaged with an internal side of a first of the pair of external layers and an internal side of a second of the pair of external layers so as to create a mesh of variable height, core thickness, yarn density, and yarn spacing; and

edges of the engineered fabric are sealed.

7. The footwear upper according to claim 6 , wherein the engineered fabric has a padding.

8. The footwear upper according to claim 6 , wherein the internal core is thicker than each of the pair of external layers.

9. The footwear upper according to claim 6 , wherein the internal core has a different yarn distribution than the pair of external layers.

10. The footwear upper according to claim 6 , wherein the different yarns are interwoven.

11. The footwear upper according to claim 6 , wherein at least one of the different yarns is natural.

12. The footwear upper according to claim 6 , wherein at least one of the different yarns is synthetic.