4-Strand Floss makes beautiful bodies on salmon flies. It lays very flat and the colors are amazingly vibrant. As the name implies, this floss comes off the spool in four separate strands. 20 yards per spool.
Uni Yarn is a very smooth yarn that is ideal for salmon and steelhead flies. It makes very nice tags or yarn bodies. If Medium Chenille is too bulky of a look then give Uni Yarn a try. The colors are very vibrant and won't run or fade.