This useful tool weighs under six ounces, fits in a pocket, and expands into a durable 25" x 21" sheet net! Simply open the lightweight tubes that automatically snap together to 30", push the tubes through the sleeve, place the net diagonal to the stream current, and shuffle rocks upstream to dislodge organisms. Ideal for educators, naturalists, students, and, of course, fly fishermen who need to understand what the trout are feeding on before selecting the right lure to use.