Not sea sponge!!
I've used several sea sponges, and these are definitely synthetic. I should have been more cautious due to the low price. The feel is more scratchy than a natural sponge, and much firmer (I like the softness of natural sponge much better). The gloves weren't necessary to me, and I don't like how they feel (plus, wearing gloves in the shower feels really weird). Too scratchy. I won't make the same mistake twice.
Rating: 3 stars