From the pattern:

These are the first in a series of works I plan to design integrating doubled garter stitch and double-knitting. The flexibility of this combination of techniques adds a whole new dimension to the practical application of double-knitting.

This pattern includes an optional bonus two-pattern section for the top front of the booties — the R and L correspond to the right and left footprints on the bottom of the booties; however, when the booties are turned inside out, the footprints change from left to right and vice versa, so the R and the L also change places using two-pattern charts.

Note: This pattern is no longer in print. An updated version entitled “Footsies v2” is available in the new revision of my original book. For more info, visit Extreme Double-Knitting: Revised Edition.