Can I use a mattress topper on a pillow-top mattress?

Yes, you can use a topper on a pillow-top mattress if you want to adjust the feel further for example, if the pillow-top is still too firm or you want extra protection. Keep in mind that stacking too much softness can reduce support and make the surface feel unstable, so it's best to choose a topper that complements, rather than overwhelms, the pillow-top.