Under the hood
-
.header-1 {
font-family: 'Avenir LT W02 55 Roman', helvetica, sans-serif;
font-size: 28px;
font-style: normal;
font-weight: normal;
letter-spacing: -1px;
line-height: 28px;
text-transform: none;
color: #373737;
}
Avenir is available from Adobe Fonts, Fonts.com and MyFonts.