Material is a big factor in the quality of your mattress toppers. Cotton, latex, and wool are all common materials for bed toppers. Cotton tends to be much thinner than other materials and doesn’t provide much support. Wool pads can get super hot at night—a real nightmare if you’re already a hot sleeper. Memory foam is usually the best material for a mattress topper. Memory foam toppers are ultra-contouring and pain-relieving, they offer a lot of support, and they also allow for more versatility because their comfort levels can be altered to increase softness or firmness.