Montserrat with Open Sans in action on thingthing.co

.header-1 { font-family: Montserrat, sans-serif; font-size: 12px; font-style: normal; font-weight: normal; letter-spacing: 2px; line-height: 13.2px; text-transform: uppercase; color: #C1C8C8; }
.header-2 { font-family: 'Open Sans', Arial, sans-serif; font-size: 30px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 46px; text-transform: none; color: #060606; }
.content-1 { font-family: 'Open Sans', Arial, sans-serif; font-size: 16px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 27.2px; text-transform: none; color: #9A9A9A; }
Montserrat is available from Font Squirrel, Google Web Fonts and Typekit.

Open Sans is available from Font Squirrel, Google Web Fonts, MyFonts and Typekit.

Try this combination out in Pair and Compare.
Found by @mikesten on 15 Mar 2016.

Liked by:
@mikesten @_hnk_w_ca @mishapivo @nadiark @MelodyAyas

Montserrat with Open Sans