The RIO Perception Line is not guaranteed for ice fishing, but works well in very cold weather, as you can see in the pictured below.
Unprecedented casting control and instantaneous feel. The trout line redefined.
Perception Lines are built one half a line size heavier than the standard at 30 ft. The revolutionary InTouch RIO Perception floating trout line helps anglers connect with more fish than ever before. Built with ultra-low stretch ConnectCore Technology, Perception lines provide groundbreaking levels of sensitivity for intuitively better cast timing, easier line lift, and sharp, precise mends. Lack of stretch also means enhanced detection of subtle takes and faster reaction time when setting the hook. The exclusive SureFire color system (RIO’s unique tri-color distance measure) improves casting accuracy by making it easy to gauge exact distances with a quick glance. It is easier to drop your fly precisely in the center of the feeding lane when you can gauge the exact distance.