FIG. 1 is a front perspective view of the back rest with lumbar support;
FIG. 2 is a rear perspective view of the back rest with lumbar support;
FIG. 3 is a left side elevational view of the back rest with lumbar support;
FIG. 4 is a from view of the back rest with lumbar support;
FIG. 5 is a right side elevational view of the back rest with lumbar support;
FIG. 6 is a rear view of the back rest with lumbar support;
FIG. 7 is a top view of the back rest with lumbar support;
FIG. 8 is a bottom view of the back rest with lumbar support;
FIG. 9 is a front perspective view of a first variant of the back rest;
FIG. 10 is a rear perspective view of a first variant of the back rest;
FIG. 11 is a left side elevational view of the first variant of the back rest;
FIG. 12 is a front view of the first variant of the back rest;
FIG. 13 is a right side elevational view of the first variant of the back rest;
FIG. 14 is a rear view of the first variant of the back rest;
FIG. 15 is a top view of the first variant of the back rest; and,
FIG. 16 is a bottom view of the first variant of the back rest.
The broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design.