Premium sections are built with global Design Variables and Presets. That means you change your brand once and the whole section updates.
What this saves you
Without Design Variables, matching a section to a brand means editing colors and fonts on many modules by hand. With them, you set your brand colors and fonts in one place and every module that uses those variables updates together.
Save your own brand setups
Members can save their own global Design Variables and Presets to their DiviVault account, so your brand setups travel with you across sites. Saving global Variables and Presets to your account is a membership feature.