I don't like all Sanuks, but I do love the ones that I like. These fall into that category.
They are stylish, well made, light, pack down well for travel and have good ventilation (very important).
They also look smarter than you might think. I mean, I'd never where them at the office or with clients during the day, but definitely with work colleagues in the evening. Oh, and you can usually just wash them in the washer on delicate cycle.