The default widths (breakpoints) we use are:

• All: 0px and up — (all-{column-span})
• Extra small: 320px and up — (.xsmall-{column-span})
• Small: 480px and up — ((.small-{column-span})
• Medium: 750px and up — ((.medium-{column-span})
• Large: 960px and up — ((.large-{column-span})
• Extra large: 1300px and up — ((.xlarge-{column-span})