1.5" of our Certified Organic pure wool certified organically processed by Oregon Tilth USA. Most wool, even organic is processed at regular plants and acquire poly fibers during the processing. Ours is pure. We then put organic cotton European fabric on both sides and expertly sew the edges and tuft throughout for a great, long lasting, very breathable pad. This will soften your mattress and allow great air flow. Natural Elastic Straps on adult sizes to hold in place. No other company has this kind of purity. Made in USA.
Though not necessary, it is always good to regularly turn, flip, and air these out. Putting out in the Sun is also beneficial.