Hareline Beetle Back Foam is a high-quality, closed-cell foam used by fly tiers to create realistic, buoyant backs on terrestrial patterns like beetles, hoppers, and ants. It's known for its durability, flexibility, and ease of use, making it ideal for shaping bodies and adding flotation to dry flies. The foam comes in a variety of colors and thicknesses, allowing tiers to match natural insect hues or create attractor patterns. Whether you're tying simple foam beetles or more intricate terrestrial imitations, Hareline Beetle Back Foam is a reliable choice for effective, long-floating flies.