Wapsi Sili Legs / Hareline Crazy Legs Solid and Speckle Flake. Sili Legs and/or Crazy Legs. As their name suggests, Sili Legs are silicone impregnated legs. Made of silicone, they have a translucency and flexibility that is unmatched by conventional rubber legs. This allows fly tyers to choose leg colors that blend in with the overall color scheme of their flies thus creating realistic looking fly patterns. Many innovative patterns are utilizing these rubber legs. 5 bands of 23 legs and over 5" long.