Numeric curl typing charts are commercial conventions, not measurements. Here is what actually varies physically in hair texture and how to shop when 3B means different things to different sellers.
Heat friendly fiber tolerates a low setting on a styling tool. It does not behave like human hair, and the failure mode when you exceed its limit is permanent.
Remy hair keeps every strand pointing the same way. Non-Remy does not, and the resulting friction is the reason some wigs mat within weeks no matter how you care for them.
Blend wigs mix human hair with synthetic fiber to get style memory at a lower price. The catch is that two materials with different heat tolerances age at different speeds.
Human hair is not simply the better option. It costs more, demands more work, and behaves like hair in bad weather. Here is the comparison by cost per wear and by effort.
A wig that matched perfectly in the shop can look wrong the moment you step outside. The cause is measurable physics, not a defective product, and there is a way to test for it.
Blonde wigs cost more and last less, and the reason is visible under an electron microscope. Here is what bleaching does to the fiber and what that means for buying and care.
