This Czech-style nymph is built in the heavy, slim tradition of competition nymphs, designed to sink fast and drift naturally along the bottom.
UV accents add visibility that helps trigger strikes. Fish it deep in riffles and runs, either under an indicator or tight-line nymphing.
Restock your nymph box before your next trip; productive patterns go fast. Fish it deep along the bottom, where trout do the vast majority of their feeding.