For the ice angler looking for a super-stealthy approach: the fluorocarbon used in crafting our Cabela's Ice Fishing Fluorocarbon Line is 100% pure PVDF line, not just coated. That means it has the same refractive index as water, which makes it virtually invisible to fish regardless of light conditions. Our formula includes a silicone finish to give you a line that's soft and smooth, with superior knot strength, abrasion resistance, and impact-shock resistance. In addition, Cabela's Ice Fishing Fluorocarbon's low stretch provides maximum sensitivity for quick bite detection, and sinks exceptionally fast so you can start your jig stroke quickly. Once you try this outstanding ice fishing line, you'll never go back to mono! 100% fluorocarbon Soft, smooth silicone finish Virtually invisible to fish in any light High knot strength; abrasion- and impact- resistant Low stretch for great feel Sinks exceptionally fast