$max-widths: (
  '-none': none,
  '-100': 100%,
  '-measure': 20rem,
  '-measure-narrow': 30rem,
  '-measure-wide': 34rem
);

@include generateFromMap(
  $map: $linear-scale,
  $append-map: $max-widths,
  $selector-prefix: 'mw',
  $properties: max-width
);