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The 4 types of basic design factors of pillow: (A) standard pillow: 455 length (L) × 297 width (W) × 110 height (H); (B) cradle pillow: 455 L × 297 W × 110 H, with a circular recess (diameter = 100); (C) cervical pillow: 455 L, cylindrical shape (diameter = 110); and (D) shoulder pillow: 658 L × 238 W × 50 H (unit: millimeters). The complete pillow designs were made of 100% cotton and filled up with cotton, which was moderately soft. (Color version of figure is available online.)
