LineSIGHT GLOLineSIGHT GLO from RestorLine Glow in the Dark Fly Line Indicator Permanent, Seamless, & Invisible Until Dark LineSIGHT GLO is an innovative additive technology that transforms your existing fly line into a high visibility nighttime tool without bulk or compromise. How it works: Our proprietary glow in the dark polymer bonds directly and seamlessly to the fly lines outer jacket. A pre sized heat shrink sleeve is then applied over the treated section