Tying the beginners Egg Laying CDC Sedge

I present to you a sedge model that I really like because I learned to tie it when I was a beginner, many many years ago. It is a fly that floats very well, is easy to tie and is efficient on the water fast and very fast. In addition, it can also be used as a swimming adult caddis.
Materials:
Hook: Daiichi 1190 #160
Thread: light olive
Underbody: kapok natural ( to give a fat body profile)
Body: goose biot in light olive
Eggs: spectra dubbing in green or dark-brown green
Wing: 4 CDC grey feathers

[garynoonan]

Lovely tying. Is the pale cream-white dubbing used to add some bulk to the body and retain the bright colour of the biot when wet?