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Strobel shoe construction is a popular method, especially for athletic shoes, where the shoe's upper is sewn directly to a fabric or non-woven "sock" bottom using a special Strobel stitch, creating a flexible, sock-like unit that's then cemented to the outsole for a lightweight, bendable shoe with good shock absorption, commonly seen in running and casual footwear. You can often spot it by the stitching visible along the bottom edge inside the shoe. (AI)