Originally designed by NASA for aircraft cushions, memory foam is made mostly from a type of plastic called ... solid memory foam pillows have ventilation holes to promote air circulation.
Inflatable pillows have innate travel advantages, such as deflating and packing up super small. They're also great for adjusting the firmness by controlling how much air you put into them.
I’ve tested dozens of different pillows throughout my career as a sleep ... and may contain polyethylene (a type of plastic) or phase-change materials (PCMs), which are usually tiny fibers ...