Help me understand this bread!

Hi all, apologies if this post is in the wrong section. I'm new here! I've just started getting into baking and now that I've made a few loaves I'm curious about one of my favorite breads to buy– a cheese and leek loaf from IJ Mellis. I've never seen a bread with a top like it (you can see some photos at: https://www.facebook.com/mellischeese/posts/spent-the-day-yesterday-drooling-over-our-wide-selection-of-bread-from-gh-barnet/1133978913328011/ ). It's super fluffy and the top almost looks... whipped? And the outside isn't much of a crust, it just seems slightly more browned. Otherwise it's just a soft white loaf! Anyone have any ideas how they achieved this?