An upper (120, 520, 620) for an article of footwear (100, 600), the upper comprising: a knitted component having a first yarn and a second yarn, wherein the first yarn comprises a core with a sheath, the sheath being formed of a thermoplastic material having a melting temperature, wherein the second yarn is free of the thermoplastic material, wherein the second yarn has a melting point or decomposition temperature higher than the melting point of the first yarn, wherein the knitted component further comprises a first layer having a first surface and a second layer having a second surface, wherein the first surface forms an outer surface of the upper (120, 520, 620) when the upper (120, 520, 620) is incorporated into the article of footwear (100, 600), wherein the first layer and the second layer are secured via a knit structure of the knitted component, wherein the knitted component further comprises a first region extending along an edge adjacent to a biteline of the upper (120, 520, 620) when the upper (120, 520, 620) is incorporated into the article of footwear (120, 520, 620) and a second region extending along a throat area when the upper (120, 520, 620) is incorporated into the article of footwear (100, 600), wherein the upper is characterized in that the first region comprises the first surface formed by the first yarn and the second surface formed by the second yarn, wherein the first layer excludes the first yarn in the second region, wherein a fused area (126, 626) extending along the edge adjacent to the biteline of the upper (120, 520, 620) when the upper (120, 520, 620) is incorporated into the article of footwear (100, 600) is formed by the thermoplastic polymer material from the first layer in the first region, and wherein the fused area (126, 626) terminates adjacent the throat area of the upper (120, 520, 620) when the upper (120, 520, 620) is incorporated into the article of footwear (100, 600). a knitted component having a first yarn and a second yarn, wherein the first yarn comprises a core with a sheath, the sheath being formed of a thermoplastic material having a melting temperature, wherein the second yarn is free of the thermoplastic material, wherein the second yarn has a melting point or decomposition temperature higher than the melting point of the first yarn, wherein the knitted component further comprises a first layer having a first surface and a second layer having a second surface, wherein the first surface forms an outer surface of the upper (120, 520, 620) when the upper (120, 520, 620) is incorporated into the article of footwear (100, 600), wherein the first layer and the second layer are secured via a knit structure of the knitted component, wherein the knitted component further comprises a first region extending along an edge adjacent to a biteline of the upper (120, 520, 620) when the upper (120, 520, 620) is incorporated into the article of footwear (120, 520, 620) and a second region extending along a throat area when the upper (120, 520, 620) is incorporated into the article of footwear (100, 600), wherein the upper is characterized in that the first region comprises the first surface formed by the first yarn and the second surface formed by the second yarn, wherein the first layer excludes the first yarn in the second region, wherein a fused area (126, 626) extending along the edge adjacent to the biteline of the upper (120, 520, 620) when the upper (120, 520, 620) is incorporated into the article of footwear (100, 600) is formed by the thermoplastic polymer material from the first layer in the first region, and wherein the fused area (126, 626) terminates adjacent the throat area of the upper (120, 520, 620) when the upper (120, 520, 620) is incorporated into the article of footwear (100, 600).