Muli with Playfair Display in action on caxis.com

Under the hood

.header-1 { font-family: Muli, sans-serif; font-size: 18px; font-style: normal; font-weight: 800; letter-spacing: normal; line-height: 22px; text-transform: none; color: #2E3038; }
.header-2 { font-family: "Playfair Display", serif; font-size: 64px; font-style: normal; font-weight: 700; letter-spacing: normal; line-height: 64px; text-transform: none; color: #2E3038; }
.content-1 { font-family: Muli, sans-serif, sans-serif; font-size: 16px; font-style: normal; font-weight: 400; letter-spacing: normal; line-height: 19px; text-transform: none; color: #8B92AB; }

Muli is available from Font Squirrel and Typekit.