Have you ever thrown out an old mattress?
Did you notice how unusually heavy it was?
The disgusting truth is that the weight you might have felt was not just the mattress itself. The original materials that make up the mattress are still there, but there's some extra weight your mattress gains over time. It is gross to imagine, but after years of use, mattresses accumulate dead skin, liquids, oils, and all sorts of other byproducts that our bodies have to offer.
Luckily, there are some simple ways to avoid having a mattress that's filled with so much "gunk."