The CDC Biot Comparadun is a highly effective mayfly imitation that blends the classic Comparadun profile with modern CDC performance. Its slender, segmented biot body creates a lifelike taper and natural coloration, while the upright CDC wing offers both buoyancy and movement, perfectly mimicking an emerging or freshly hatched dun. The lack of hackle allows the fly to sit low and flush in the surface film, producing a realistic footprint that fools even the most selective trout. Ideal for slow, clear water and technical hatches such as Blue-Winged Olives, PMDs, or Sulphurs, the CDC Biot Comparadun delivers exceptional visibility, floatation, and natural drift. A refined update to a proven classic, it’s a go-to pattern whenever presentation and realism matter most.