The key difference between the Lullaby Earth Twin 7" Mattress with Washable Cover and the Lullaby Earth Twin 6" Mattress is that the 7" version includes a removable, washable cover, while the 6" version does not. However, you can purchase a separate cover for the Lullaby Earth Twin 6" Mattress. Additionally, the 7" mattress is 1" thicker than the 6" mattress.
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