Krystal flash is an amazingly versatile flashy fiber material that has been around for a long time and continues to earn our respect day after day, year after year. From the wings of a salmon fly to the topping of wet flies, Krystal Flash is a must-have in every fly tyer's stock. With an abundance of colors from Hareline, some are imbued with UV technology to make sure that the flash stands out even in murky water conditions.