McFlyFoam Egg Yarn is spongier and more compact than standard egg yarn. Very good for smaller egg flies. Very popular stuff amongst many guides and fly tyers. McFlyFoam Egg Yarn has been called the best egg yarn you'll ever use. Tie everything from egg patterns to sculpins, woolhead flies, and crabs. It is a continuous filament which is dyed using colorfast dyes to help prevent the material from fading. Find the McFly Foam Clown here.