Found this on a google fly fishing site
ANTI TWIST MICRO GROOVE SYSTEM
The six microgrooves reduce any tendency for the line to twist to a minimum, ensuring it stays straight with it's original extruded profile. This is a remarkable development and an advantage that many see as being the most important in this line's specification.
LONGER CASTING
The reduced surface friction resulting from the grooved surface and lighter weight assists longer and smoother casting.
PERMANENT HIGH FLOATING
Flo-Cast's hexagonal central hole reduces it's specific gravity from 1.14 to 1.04, making the line more buoyant and permanently floating.
A TRULY UNIQUE LINE
Flo-Cast is so revolutionary that the extent of what it can be used for has yet to be fully established. We do know that it is already delivering in the areas for stick float and wagler fishing and the unique characteristics of this new product will give great benefits in float fishing, carp fishing, trout fishing and rig making when beach fishing.
To get a central hole in a diameter as fine as 0.18mm is a remarkable feat and at present, although we have been asked, it doesn't look as though we can go any lower than this. The other remarkable thing is that the ultra high quality polymers mean that Flo-Cast is as strong, or stronger than most other hi-tech lines that don't have a hole in the middle.
It is generally recommended that Flo-Cast is used only when the general water temperature is above 10 degrees celsius. Due to the method of construction, high abrasion in very cold conditions can cause splitting in the line and while this does not affect the line's performance it can make it difficult to handle. If this does happen the section can be simply cut off and replaced.
The colour has been carefully chosen making it invisible against the sky from the fishes point of view but clearly visible on the surface so the angler knows when to correct any bow in front of the float.
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