The Caddis Larva in olive is perhaps one of the most widely used flies in the boxes of guides and just about anyone on the river. Having a row of these in the box will ensure you’re ready to give the trout what they want during a caddis hatch. From spring to early fall these nymphs catch trout time after time. Most guides in the Rockies keep a few on them at all times and were sure after you try for yourself, you’ll know why.