Alpaca wool is just the same as any other wool? I've just purchased a cheap one that looks great which isn't 100% alpaca like 70% or something. Never worn it before so dunno how warm or soft it will be.
I am considering getting a underponcho for my DD waterproof poncho just to make it more comfortable. By this I mean a very lightweight cool poncho which I can wear under the poncho to avoid the uncomfortable material.
Alpaca is softer and lighter than sheep wool and, pound for pound, is warmer.
That's my understanding also. But is it as durable? I've heard it wears out sooner/easier.