They are designed to only be used with water and through the massaging action they gently exfoliate the skin whilst removing make up.
Pretty much like a classic flannel but with the convenience of the glove style.
They do indeed remove the make up however you do need to go over the skin a few times to remove all traces of make up.
If you wear waterproof mascara I would remove this with a separate remover as the mitts with water alone will probably not remove it effectively.
This product would be best for people who have a sensitive skin and prefer to cleanse with water alone.
You can wash your mitt out after each use with hand soap but I would advise to machine wash them every so often to ensure they are completely clean.
These are £4.00 each and available from http://www.amazemitt.co.uk/