I wanted to recap this thread and update it some. I went into Orvis recently and was looking for this material still on a local level. Check out the enclosed package and how they labeled the material and then guess which material was actually in that bag.
Look closely at how UTC labels both of their actual spools and then how Orvis labeled the product. No wonder there is confusion on fly tying materials.
The Orvis bag is labeled Flashback and UTC does have flashback and I have put a spool of Flashback Ice Blue Pearl in the photo but that is not what was in that bag. The bag contained the UTC Mirage Opal product. So now I have one spool in size small. Still looking for the same stuff in Medium without ordering it. $2 for a spool and $17.95 to ship - so I exagerate a little.