Rating: 4 / 5
4.6 oz for pair of Zem Playa Low size Medium. This size will accommodate ( a snug fit) a Superfeet green size D.
5.0 oz for pair of Playa Low size Large.
We just returned from six weeks hiking in Turkey using these as camp shoes. As it turns out we rarely used them. We use camp shoes only when our hiking shoes are saturated and we want to retreat to dry shoes at lunch and in camp, and our trip was pretty dry. However, we did use them once for river crossing and a few times in the evening, and they worked out just fine.
The neoprene gives a pretty tight fit, I'd size up if you're unsure. Also, if you like support underfoot, by sizing up you can transfer your insole from your hiking shoes.
Advantage: they are thin neoprene, so they are quite warm - nice for cool nights. Also, the neoprene keeps the dirt out effectively.
Disadvantage: because they are neoprene, they don't breathe. When I've been in soggy shoes all day, I prefer to let my feet thoroughly air out.
I've also been happy with Crocs Cleo (7.4 oz in size Womens 9)
The strap is hinged, so they are reasonably compact - MUCH more compact (and lighter) than the standard big ugly Crocs. Unlike the Zem Playa, the dirt gets in but wet feet can air out. Not usable for river crossings. Longer lasting than the Zems, but also heavier.