Straggle Ice Chenille (also known as Polar Chenille or Ice Straggle Cactus Chenille) is great for hackles on nymphs, streamers, and topwater flies.  It even works well as a flashy wet fly hackle.  Straggle Ice Chenille is a highly mobile material with both fluorescent and natural colors.

Semperfli Ice Straggle Chenille is a larger version of straggle string. Great for big nymphs and smaller streamer patterns.