A Czech Nymphis a regular fly imitation that the Semperfli team fish on our outings. The Semperfli team developed a very good Rhyac wool to make tying the Rhyacophila larvae (Caddis Larva – Green Rock Worm) easy, with this superb wool. Simply wind around the hook, add a clear shellback, and cover the head with a black permanent marker pen. For an even better imitation add Semperfli Straggle String ss-SF7300FL at the head, which with its UV flecks adds stunning legs and a bit of flash.