I love swinging soft hackles for trout.The soft hackle flies are the classic example of impressionism in fly tying. For decades a wide variety of soft hackles have held a key place in my fly boxes. Depending on the size, body and hackle color they can make a reasonable presentation of a wide variety of typical trout "food". Have had success with them as small as 20s and 18s (chironomids and scuds) to as large as size 6s & 4s ( spiders for coho and cutthroat. The combination of suggestive colors and shapes coupled with the translucence and subtle motion provide by the sparse hackle can be deadly!