An upper for an article of footwear (100, 200) being formed of a knitted component (104, 204) comprising: a first portion (132, 232), the first portion having a first layer (140, 240) and a second layer (142, 242), where the first layer and the second layer each have opposite-facing surfaces, the first layer and the second layer forming a pocket therebetween, and the first layer and the second layer being secured via at least one knit structure of the knitted component at a boundary (150, 250) of the first portion; and a second portion (134, 234) extending from the boundary of the first portion and secured at the boundary via at least one knit structure of the knitted component, wherein the second portion includes a double jersey knit structure having multiple layers that are tightly bound together such that they are inseparable and/or are not readily indistinguishable, wherein the double jersey knit structure of the second portion (134, 234) forms an outer surface (138, 238) of the article of footwear (100, 200) on at least one of a medial and lateral side (110, 108), wherein yarns of both the first layer (140, 240) and the second layer (142, 242) of the first portion (132, 232) are incorporated into the second portion (134, 234), wherein the second layer of the first portion at least partially forms an underfoot area of the knitted component, wherein the second portion (134, 234) has an elasticity that is less than an elasticity of the first layer (140, 240) and/or the second layer (142, 242) of the first portion (132, 232), and wherein the first layer of the first portion forms at least one of: (a) an overfoot portion of the article of footwear such that the pocket forms a void of the article of footwear for receiving a foot and such that the first layer forms a top surface of the void, and (b) an underfoot portion of the article of footwear such that the first layer forms a bottom surface of the void of the article of footwear. a first portion (132, 232), the first portion having a first layer (140, 240) and a second layer (142, 242), where the first layer and the second layer each have opposite-facing surfaces, the first layer and the second layer forming a pocket therebetween, and the first layer and the second layer being secured via at least one knit structure of the knitted component at a boundary (150, 250) of the first portion; and a second portion (134, 234) extending from the boundary of the first portion and secured at the boundary via at least one knit structure of the knitted component, wherein the second portion includes a double jersey knit structure having multiple layers that are tightly bound together such that they are inseparable and/or are not readily indistinguishable, wherein the double jersey knit structure of the second portion (134, 234) forms an outer surface (138, 238) of the article of footwear (100, 200) on at least one of a medial and lateral side (110, 108), wherein yarns of both the first layer (140, 240) and the second layer (142, 242) of the first portion (132, 232) are incorporated into the second portion (134, 234), wherein the second layer of the first portion at least partially forms an underfoot area of the knitted component, wherein the second portion (134, 234) has an elasticity that is less than an elasticity of the first layer (140, 240) and/or the second layer (142, 242) of the first portion (132, 232), and wherein the first layer of the first portion forms at least one of: (a) an overfoot portion of the article of footwear such that the pocket forms a void of the article of footwear for receiving a foot and such that the first layer forms a top surface of the void, and (b) an underfoot portion of the article of footwear such that the first layer forms a bottom surface of the void of the article of footwear. (a) an overfoot portion of the article of footwear such that the pocket forms a void of the article of footwear for receiving a foot and such that the first layer forms a top surface of the void, and (b) an underfoot portion of the article of footwear such that the first layer forms a bottom surface of the void of the article of footwear.