Flexcards is a bolt theme built with bootstrap 4, therefore, and other reason, it is still experimental. It makes use of bootstrap 'cards' (flexboxes) in a fluid container. It is ordering the cards in reading direction, fully responsive. Another interesting point might be building bolt components with bootstrap 4 css/js and try it as a replacement for foundation.
Demo: choose 'flexcards' on http://try.bolt.cm
**Please file issues and comments to http://www.github.com/sablonier/flexcards**