YBD box) and they're great for cleansing on make-up free days. The sponge is made from 100% vegetable fibres. When completely dry, it's quite rough and solid so you kind of wonder if it's good for your skin. However, once saturated with water, it becomes much softer.
(solid as a rock)
(after running under the tap)
I find that the Konjac sponges are a lot kinder to the skin than muslin cloths, and you can't feel the exfoliation (whereas a muslin cloth may sometimes be a bit abrasive). This might not appeal to everyone, but seeing as I use it on the days I'm not wearing makeup, I don't feel that I need the extra exfoliation that I get when using muslin cloths. Because it is 100% natural, the sponge will eventually break down, although it should last at least 2-3 months with regular use.
If you have sensitive skin or just don't like muslin cloths when cleansing, I'd definitely recommend trying the Konjac sponges. You can purchase Konjac Sponges from their own website, as well as a number of retailers, including Look Fantastic and Feel Unique.