I agree with Goldilocks its not the normal nylon - it is possibly SaranTC or something similar as that tends to be the industry standard for thermochromatic hair.
However, their hair wasn't "stringy" or "cottony" per se at the start - it was no different than if you purchased colour changing hair from a hair seller right now, nice brushable hair [perhaps a little more oily in texture]. But because [similar to the other UV sensitive hair on some ponies] in order to react to heat, over time or with over exposure it simply breaks down and becomes either stringy or cottony. The liquid crystals or leuco dyes used dont last forever. Them breaking down damages the hair itself hence the stringy/cottony effect.
Here is a picture of a pony with her hair "pre" breakdown - you can see it is not stringy but neither is it as smooth as other pony hair.
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