I did an SBS for this fly about 4 years ago for a friend, and since then I have posted it a few place around the 'net - thought I would share it with y'all to help alleviate the shack-nasties.
The original technowog is credited to Frans Jansen - this is a slight variation, with larger wings for more commotion, more foam for higher flotation in rough water, and color-fast yarn for a tail. This thing is an awesome coho fly, and can be adapted to many color patterns and sizes for different looks or different species.
Materials are as follows:
Hook: Tiemco 8089NP sz6
Thread: Danville 210 denier flat waxed nylon, pink
Tail: McFly yarn, 2 strands, flame
Body: "Funky Foam Fun" 3mm closed cell foam, pink
Cement: Zap-A-Gap (for tacking foam), Sally Hansen Hard as Nails
Cut 2 strips of foam 3"x3/16", one strip 1 1/2"x7/16". Separate and cut 2 strands of yarn 1 1/2".
Underwrap if desired, then wrap in yarn tail securely.
Place one drop of zap-a-gap on wraps, then press the two longer strips together on either side of wraps, with 1/4" of foam extending past threadline towards the hookeye.
Wrap foam securely in place, taking care not to cut it with excessive thread tension.
Place the short, fat strip of foam on top of the fly, again with 1/4" of foam extending past threadline towards the hookeye.
Wrap 3 times loosely, then increase tension slowly. Unwrap 2 wraps under tension, then rewrap as slack is taken out.
Cross out of materials and wrap the hook forward, stopping 1/4" from eye.
Place one drop of zap-a-gap on hook at terminus of thread (threadline).
Fold the long strips forward under slight tension, creating a bow in the foam.
Press the two pieces together and wrap 3 times.