The same supply length, three different reaches
Arda lists Short CLASSIC with 48 cm hair, Long with approximately 90 cm and X-Long with approximately 127 cm. In all three descriptions, the sewn strip is 244 cm. Moving up that length ladder therefore does not buy a longer track to distribute around a wig. It buys a different reach of fibre from the track.
A short addition can be the complete choice
Suppose the project calls for additional fibre in a relatively short part of a character hairstyle. Long or X-Long is not automatically a more complete supply simply because its label sounds larger. The maker should first decide which hanging length the intended shape actually uses. A shorter option can answer that task without making the maximum available fibre length the starting assumption.
Conversely, several Short packs still do not turn each individual 48 cm strand into the 90 cm fibre described for Long. If the missing part is the required reach, changing pack quantity answers a different problem. Keep the intended long silhouette separate from how much track the maker needs to allocate.
Reserve X-Long for a reason that uses it
X-Long makes sense to investigate when the design genuinely requires the additional fibre reach. Arda also flags the long material as potentially high maintenance, so extra length is not a neutral bonus to acquire by default. For a plan already answered by Long, the 127 cm option should have a purpose beyond being the largest number.
These pages do not establish equal density or equal finished coverage among the products. Choose the length for the actual silhouette, then let the making plan determine the amount. That prevents either the longest fibre or the largest pile of packs from becoming a substitute for the missing design decision.
Sources & further reading
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