A mattress protector can prevent your mattress from getting heavier with age. But not for pleasant reasons. On average, your mattress will double in weight after 10 years due to the following:
Your mattress being filled with dead dust mites and their detritus.
In one night’s sleep, you will shed an average of 12,000,000 dead skin cells, which is why dust mites thrive in your bed.
After 14 years, your mattress now has more dust mites than the population of New York City, four full bathtubs of sweat and 19 KG of dead skin.