A method of making an article of footwear , comprising: positioning a sheet of upper material within a chamber , the sheet dividing the chamber into a first compartment on a first side of the sheet and a second compartment on a second side of the sheet ; positioning at least a portion of a footwear last in the first compartment on the first side of the sheet of upper material; applying an environmental pressure differential across the sheet of upper material wherein a first environmental pressure in the first compartment is lower than a second environmental pressure in the second compartment ; wherein the environmental pressure differential draws the sheet of upper material against the footwear last thereby forming at least a portion of an upper of the article of footwear ; wherein applying the environmental pressure differential includes: drawing a vacuum in the first compartment , drawing a vacuum in the second compartment when drawing the vacuum in the first compartment , and subsequently allowing the environmental pressure in the second compartment to return to atmospheric pressure, thus producing the environmental pressure differential between the vacuum drawn in the first compartment and the atmospheric pressure in the second compartment , increasing the environmental pressure differential by pressurizing the second compartment to a pressure above atmospheric pressure; wherein the environmental pressure differential draws the sheet against the footwear last thereby forming a first component and a second component spaced apart from the first component within the sheet , and assembling the article of footwear including fixedly attaching the upper of the article of footwear to a sole structure. positioning a sheet of upper material within a chamber , the sheet dividing the chamber into a first compartment on a first side of the sheet and a second compartment on a second side of the sheet ; positioning at least a portion of a footwear last in the first compartment on the first side of the sheet of upper material; applying an environmental pressure differential across the sheet of upper material wherein a first environmental pressure in the first compartment is lower than a second environmental pressure in the second compartment ; wherein the environmental pressure differential draws the sheet of upper material against the footwear last thereby forming at least a portion of an upper of the article of footwear ; wherein applying the environmental pressure differential includes: drawing a vacuum in the first compartment , drawing a vacuum in the second compartment when drawing the vacuum in the first compartment , and subsequently allowing the environmental pressure in the second compartment to return to atmospheric pressure, thus producing the environmental pressure differential between the vacuum drawn in the first compartment and the atmospheric pressure in the second compartment , drawing a vacuum in the first compartment , drawing a vacuum in the second compartment when drawing the vacuum in the first compartment , and subsequently allowing the environmental pressure in the second compartment to return to atmospheric pressure, thus producing the environmental pressure differential between the vacuum drawn in the first compartment and the atmospheric pressure in the second compartment , increasing the environmental pressure differential by pressurizing the second compartment to a pressure above atmospheric pressure; wherein the environmental pressure differential draws the sheet against the footwear last thereby forming a first component and a second component spaced apart from the first component within the sheet , and assembling the article of footwear including fixedly attaching the upper of the article of footwear to a sole structure. <EOS>