Open Sans in action on pushdoctor.co.uk

.header-1 { font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 37px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 46px; text-transform: none; color: #222222; }
.content-1 { font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 26px; text-transform: none; color: #222222; }
.content-2 { font-family: 'Open Sans', Arial, Helvetica, sans-serif; font-size: 15px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 23px; text-transform: none; color: #FFFFFF; background-color: #70D609; }
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 21 Mar 2016.

Liked by:
@mikesten @AndOlesya

Open Sans