Orvis Helios 3D and 3F Fly Rods The H3 brings us a fundamental shift from flex profiles to a new frontier in accuracy and purpose-driven design. Helios 3F and 3D each offer uncompromising purpose. 3F is accuracy with finesse, a dry fly angler's dream. 3D is accuracy with power at distance for pinpoint delivery of larger flies. The difference is taper and stiffness, but the design foundation of accuracy remains constant. To play the game at its highest level there can be no compromise and for every angler the H3 is the pinnacle of purpose, designed to master the moment and meet the demands of accuracy on a spring creek with a 3F or a tarpon flat with a 3D. Choose the game, then choose the weapon.