Here's the process, step by step:

1. To start assembling your mattress, a nice, thick slab of latex will form your base. 3" pads are available in two firmnesses from Natural American Home, for $300.
2. Add a wool or cotton mattress topper like this one or this one from Satara, Inc. to add to the comfort of the latex base.
3. Then, wrap the two layers in a mattress pad. What you're looking for here is absorbency, breathability and warmth -- oftentimes when a mattress makes you too hot, it's this layer that's the culprit.
4. Finally, top your mattress with your favorite organic cotton or bamboo sheets, and voila!

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