We started with a one-size-fits-all mattress but we found out it`s not what the market needs. Instead, sleepers needed a mattress with adjustable firmness — so we engineered one with three firmness layers to choose from.We even added in a handy waterproof layer to protect the mattress from dust mites, moisture, and unwanted liquid spills! This design was loved by thousands of sleepers — so we reformulated our foams to make them even better.