Every foam cube is infused with temperature regulating gel beads for superior cooling performance. Plus, every pillow is wrapped in an outer cover made from Outlast material, which is made with phase-change technology developed by NASA. These materials absorb excess body heat and release heat when you need it most. This results in less overheating and night sweating. Between the gel-infused pieces and cover technology, this pillow adapts to your thermal needs and helps you to sleep more soundly.