Karla in action on lifelineventures.com

.header-1 { font-family: Karla, 'Open Sans', Arial, sans-serif; font-size: 56px; font-style: normal; font-weight: bold; letter-spacing: -1.68px; line-height: 62px; text-transform: none; color: #000000; }
.content-1 { font-family: Karla, 'Open Sans', Arial, sans-serif; font-size: 20px; font-style: normal; font-weight: 200; letter-spacing: normal; line-height: 33px; text-transform: none; color: #000000; }
Karla is available from Font Squirrel and Google Web Fonts.

Try this combination out in Pair and Compare.
Found by @mikesten on 23 Feb 2016.

Liked by:
@mikesten @adambrenecki @TrishReda

Karla