Roboto with Roboto Slab in action on thefoundersassembly.com

.header-1 { font-family: Roboto, sans-serif; font-size: 61px; font-style: normal; font-weight: 200; letter-spacing: 3px; line-height: 85.4px; text-transform: uppercase; color: #FFFFFF; }
.content-1 { font-family: 'Roboto Slab', serif; font-size: 20px; font-style: normal; font-weight: 100; letter-spacing: normal; line-height: 32px; text-transform: none; color: #FFFFFF; }
.content-2 { font-family: 'Roboto Slab', serif; font-size: 20px; font-style: normal; font-weight: 100; letter-spacing: normal; line-height: 32px; text-transform: none; color: #FFFFFF; }
Roboto is available from Font Squirrel, Google Web Fonts and Typekit.

Roboto Slab is available from Font Squirrel, Google Web Fonts and Typekit.
Found by @mikesten on 29 Feb 2016.

Roboto with Roboto Slab