Undyed Firestar (also known as Trilobal Nylon) - Very soft! Dyes easily with acid dyes.
This has a beautiful shine without shouting "I'm Here!" Blend up to 20% of this into your spinning fibers for a lovely shimmer. A little goes a long way! I use this in some of my blends to make them sparkle.
This is especially helpful in your hand spun sock yarns to reinforce your heals and toes. For felters use a fine layer for shimmer covered with a fine web of wool to allow it to felt together.
If you wish a custom color dyed just for you please ask. I dyed in small batches and I can custom dye the amount and color that you are looking for.