The 2 inch topper has 2” of Natural Talalay Latex in it. The 3” and 4” toppers both contain 3” of Natural Talalay Latex. The 4” topper is constructed in the same manner, with the same materials as our Sombrio mattress - hence the premium nature of it and price point. For most people, the 2” and 3” toppers are excellent choices. Ultimately, it depends on how much pressure relief you require. 3” will provide 50% more pressure relief compared to 2”.