From Foundation 6.4, flex is enabled by default and **only the new XY Grid is availaible**. However, others CSS versions are availaible for backward compatibility and the most common usage cases. For others uses and advanced customization, we recommand to build Foundation with custom settings (see others installation methods).
```html
-<!-- foundation-float.css: Compressed CSS with legacy Float Grid -->
+<!-- foundation-float.min.css: Compressed CSS with legacy Float Grid -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/foundation-sites@6.4.3/dist/css/foundation-float.min.css" integrity="sha256-TPcVVrzfTETpAWQ8HhBHIMT7+DbszMr5n3eFi+UwIl8= sha384-+aXh7XSzITwlvjelsNWuL1A9rT8pWGaiqMMeUjtKcsWIfzT1oV8Mp3oYxmjPK8Gv sha512-cArttU/Yh+PzfQ/dhCdfBiU9+su+fuCwFxLrlLbvuJE/ynUbstaKweVPs7Hdbok9jlv9cwt+xdk20wRz7oYErQ==" crossorigin="anonymous">
-<!-- foundation-prototype.css: Compressed CSS with prototyping classes -->
+<!-- foundation-prototype.min.css: Compressed CSS with prototyping classes -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/foundation-sites@6.4.3/dist/css/foundation-prototype.min.css" integrity="sha256-JyhZsgvsqjrdl9GPOILi/zyc+z4dcwXiyP1Q7cwWlM0= sha384-GtUT6gOaCY/S1ggTUOnqe5CQAEAZ6oVTmMq3X4vfZrvp+tLgjBEmwVxJnukor+o0 sha512-x3+KBxBjFh8PGncrfDOsJhntYDBFdJxmpb211THYkQOaGWvk7ckZG6prGUpZqz85AXgiispjow06+bDnIxnWDQ==" crossorigin="anonymous">
-<!-- foundation-rtl.css: Compressed CSS with right-to-left reading direction -->
+<!-- foundation-rtl.min.css: Compressed CSS with right-to-left reading direction -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/foundation-sites@6.4.3/dist/css/foundation-rtl.min.css" integrity="sha256-Az+E7JXW71Srarkum5QPTdnobddg2GqI1i8+nMusgLk= sha384-eBKuNtkGVmsJD0uNnWoKYYVnzDT0PXV+XNyAgmmZwYVn7MSNcaR4i5HjOpSRd0o6 sha512-d0RjiDZM/0NlD+7Y2DhUGuAUdwDIL5lS3GPAD0HEayEcrhuLuRiPYOgFWZik+gsFzsykxSn0KO6jim7ev8kIig==" crossorigin="anonymous">
```