8" natural plant based foam mattress w/orgranic cotton cover. Natural polyol based premium foam. GOTS Certified Organic cotton cover. Natural Visil fire barrier. No harmful chemicals. Spaldin''s open cell foam structure also makes our mattresses temperature neutral. Why is this important? (1) the open cell structure dissipates heat and moisture, creating a more comfortable sleep environment; and (2) where the performance of petro-based foam mattresses is sensitive to temperature; for example becoming firmer when it''s cold, but sponge-soft when it''s warm. Spaldin foams maintain their extraordinary comfort from -40º F to 170º F.