MARIN-EX with invisitec is make using a high abrasion resistant transparent core with the clear coating. This makes the line very low visable especially in saltwater. MARIN-EX is super abrasion restistant. The outside covered by a UV restistant smooth coating for durability and longer casting. Marin-EX fishing line is incredibly strong and easy to handle, tough, high-durability finish. Exceptional abrasion resistance and low memory to improve casting distance. MARIN-EX meets a wide range of freshwater and saltwater fishing situations, from casting and jigging to trolling and bottom fishing. The world's finest high visibility monofilament line, MARIN-EX features a bright yellow color that's easy to see in daylight and low-light conditions. Salmon and steelhead anglers have embraced MARIN-EX for use in drift fishing and "free-drifting"applications. MARIN-EX is also ideal for trolling applications where keeping track of multiple lines is made easy. An ideal feature for trolling and detecting subtle bites, you'll know exactly where your line is at all times.