We wanted to create a natural and sustainable, yet high-performance pillow. One suited to any sleeping style and mattress type (both affect pillow height). After many prototypes, our answer was a 100% wool pillow, wrapped in Tencel®, the award winning eco-fiber that outperforms cotton for sustainability and moisture control. Our cool wool aids in dissipating heat and wicking moisture away from your skin to keep you more comfortable. We also designed our pillow to be soft yet supportive, so your neck gets the support it needs. (All help to avoid ‘morning stiff necks’ caused by poor alignment, sweat and cold.) To make our pillows fully height-adjustable, every purchase comes with an additional bag of wool fill.