The name speaks for itself - they are incredibly comfortable, easy to put on and hold securely. They're also pretty light, I don't even realize I'm wearing them for the most part. The sole is comfortable and supports walking (which I do quite often, so it's important to me) without being stiff. The thin top layer is breathable and ideal for hot climates, I never felt like my feet got overheated despite temperatures of 90+F (and I expect the same to happen as temperatures warm up). Also, they probably aren't suited to colder climates. I live in a warm place so I can wear them all year round but in some places where the real winters are not very good. I might not wear them in rainy places either, by which I mean they're perfectly suitable for walking on wet surfaces (it's a thick sole), but the upper will likely let the rain through and you won't step in a puddle want. I like them so much that I bought a second pair shortly after the first one just as a future spare :)