http://chriskief.com/2014/10/31/using-typekit-fonts-locally-while-offline-no-internet-connection/

fonts.css

/*
  Original
  https://use.typekit.net/c/7302fd/1w;freight-sans-pro,1,TJ9:N:i3,TJF:N:i5,TJ8:N:n3,TJB:N:n4,TJD:N:n5,TJG:N:n6/d?3bb2a6e53c9684ffdc9a9bf11e5b2a6273d805f491df729128ca517d0b865e0e191e7b5aee445efc6d4ab4dc94e67aefe35eac8915e2de0959b2bb14cb74eb97243001a4e12199258e040dfe98f737ffac5827d670b2821c337b4c001b82bb67b53127b8ef655ac395a8807eadc56b96dfce3ebaeaf23eda54a42b78fd6598bf206c475067f1648d3f4fcce42c1c8687de1fd8c8d7fdc3934dc65b290046cea982d0a7ac4abb5c8f802f88867e69
*/

/*{"c":"2014-10-30T14:18:23Z","s":"prod-origin-fd43d310","v":"9b86fd"}*/
/*
 * The Typekit service used to deliver this font or fonts for use on websites
 * is provided by Adobe and is subject to these Terms of Use
 * http://www.adobe.com/products/eulas/tou_typekit. For font license
 * information, see the list below.
 *
 * freight-sans-pro:
 *   - http://typekit.com/eulas/000000000000000000010b59
 *   - http://typekit.com/eulas/000000000000000000010b5d
 *
 * (c) 2009-2014 Adobe Systems Incorporated. All Rights Reserved.
 */

@font-face {
font-family:"freight-sans-pro";
src:url(data:font/opentype;base64,[...FONT DATA...]);
font-style:italic;font-weight:300;
}

@font-face {
font-family:"freight-sans-pro";
src:url(data:font/opentype;base64,[...FONT DATA...]);
font-style:italic;font-weight:500;
}