Synthetic Yak Hair has translucent qualities, durability, but also great because its length and wiry texture that allows you to create much larger flies. The natural fibers are great for blending because the strands of hair can be counted easily. This allows you to create flies that are more uniform in color and fullness. The coarse hair becomes supple when wet and has a life like quality when stripped. SYH is synthetic which means lightweight, great for casting pike and saltwater patterns with SYH wings.