What is this picture?

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What is shown in this image?

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corduroy wale ridges. # Corduroy's Hidden Purpose

Those distinctive ridges in corduroy aren't just for looks—they actually evolved from a practical problem: the fabric was traditionally used for workwear because the wales act like tiny channels that trap air, making it an unexpectedly warm and insulating material, which is why it became a favorite for everything from railway workers' pants to modern winter fashion.

Answer: corduroy wale ridges