DeCurry ,
Yes, its New Zealand wool...it has more 'crimp' in it that acts like coil springs for more cushion, retention and durability, and for bow silencing, the crimp dispels more sound...kind of like baffles in a muffler.
We use the same wool we use in our carpets for that very same reason. And, we use what they call 'Top', the long fibers for better tensile strength, and less shedding. We pay more for it because its the best, and it runs through our machines with less break outs unlike short staple wool.
Its also a thicker fiber, not really suitable for apparel or fabric in fine deniers.