This pattern is tied on a straight shanked hook, size 12 here. The trailing material is mylar tinsel for movement and flash in the upper strata. The body is a wound dubbing brush, but of course you could dub a similar body, in olive. The wing is a couple of stacked CDC feathers. This pattern has done very well on rivers and lakes as a diving/emerging caddis imitation. This would be an equally good pattern without the bead and fished below the surface or in the film.
SwittersB & Exploring 
Nice fly: we recently returned from a week long trip to a very low river with little flow. The killer pattern for much of our fishing was a small black nymph with tiny bead and a split thread / CDC “hackle”. The movement provided by the CDC seemed to really enhance the catch rate compared to more standard nymphs It seemed that with so little water movement the micro movement of the CDC imparted some movement to the fly which resulted in more strikes.. In essence then a VERY soft “soft hackle”..
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Thank you for sharing.
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