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_tools_fonts.scss

// ----
// Sass (v3.4.21)
// Compass (v1.0.3)
// ----

$font-name: 'GT-Walsheim';
$font-path: '../fonts/';

$weights: (
  400 'Regular',
  300 'Light',
  300 'Regular-Oblique' italic,
  500 'Medium',
  600 'Bold' bold);

@each $weight in $weights {

  $int: nth($weight, 1);
  $string: nth($weight, 2);
  $src: '#{$font-path}#{$font-name}-#{$string}';
  $length: length($weight);
  
  @font-face {
    font-family: 'GT Walsheim Pro';
    font-weight: $int;
    src: url('#{$src}.eot'); /* IE9 Compat Modes */
    src: url('#{$src}.woff') format('woff'),
         url('#{$src}.ttf') format('ttf'),
         local('#{$font-name}-#{$string}');
         
    @if ($length > 2) {
      font-style: nth($weight, 3);
    }
  }
}

app.css

@font-face {
  font-family: 'GT Walsheim Pro';
  font-weight: 400;
  src: url("../fonts/GT-Walsheim-Regular.eot");
  /* IE9 Compat Modes */
  src: url("../fonts/GT-Walsheim-Regular.woff") format("woff"), url("../fonts/GT-Walsheim-Regular.ttf") format("ttf"), local("GT-Walsheim-Regular");
}
@font-face {
  font-family: 'GT Walsheim Pro';
  font-weight: 300;
  src: url("../fonts/GT-Walsheim-Light.eot");
  /* IE9 Compat Modes */
  src: url("../fonts/GT-Walsheim-Light.woff") format("woff"), url("../fonts/GT-Walsheim-Light.ttf") format("ttf"), local("GT-Walsheim-Light");
}
@font-face {
  font-family: 'GT Walsheim Pro';
  font-weight: 300;
  src: url("../fonts/GT-Walsheim-Regular-Oblique.eot");
  /* IE9 Compat Modes */
  src: url("../fonts/GT-Walsheim-Regular-Oblique.woff") format("woff"), url("../fonts/GT-Walsheim-Regular-Oblique.ttf") format("ttf"), local("GT-Walsheim-Regular-Oblique");
  font-style: italic;
}
@font-face {
  font-family: 'GT Walsheim Pro';
  font-weight: 500;
  src: url("../fonts/GT-Walsheim-Medium.eot");
  /* IE9 Compat Modes */
  src: url("../fonts/GT-Walsheim-Medium.woff") format("woff"), url("../fonts/GT-Walsheim-Medium.ttf") format("ttf"), local("GT-Walsheim-Medium");
}
@font-face {
  font-family: 'GT Walsheim Pro';
  font-weight: 600;
  src: url("../fonts/GT-Walsheim-Bold.eot");
  /* IE9 Compat Modes */
  src: url("../fonts/GT-Walsheim-Bold.woff") format("woff"), url("../fonts/GT-Walsheim-Bold.ttf") format("ttf"), local("GT-Walsheim-Bold");
  font-style: bold;
}