I found these recently.
A lot of marketing speak here, but it gets the point across.
To make the Helix HD, the patent-pending, Hyper-Elliptical Winding process took over a year of many trials to find just the precise elliptical shape for the winding wire. This shape then had to be paired with the correct winding process that would produce these stupendous results—the maximum mass for the string’s diameter that still maintained the string’s vibrancy.
More mass makes a fuller tone; more windings give a smoother feel as well as
a brighter, more resonant tone. This provides a smoothness and performance unrivaled by any conventional string.
The Hyper-Elliptical Winding process results in an increased number of wraps along the length of the string. This increases the mass of your string, without changing its diameter or material.
They have a set with two G strings...one wound, one plain. The feel is definitely smoother than a roundwound and they have been lasting me a long time. I like em. Seem to be a nice middle ground between a flat and round.
EG