Width (girth) and by the. See Instruction on back cover. They don't go by. only upon weight. don’t get what they paid, it’s a chance we take. Now you know why. many cases were an item is listed for.
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U Part Wig Cap Top Quality S M L Size Left Centre Right Parting U Part Cap For Making Wigs Adjustable Straps Back - AliExpress
Made of high quality lace spandex, soft and comfortable for wearing, breathable and airy all day. High elasticity makes it super stretchable and not easy to deform.
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Magic U-Part Wig Cap [Center Parting]
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How to install a U-part wig - Quora
16-20 inch Yaki Straight Middle Part V Part Wig - VPS003 Size-1 (Circumference 21.5 - 22) / 20 / Yaki (Mimic Afro Relaxed Hair)