Which pajamas are cooler satin or silk
Polyester is a man-made, synthetic material. Polyester pajamas wear well over the body making for a comfortable night's sleep. Polyester, however, is not a naturally breathable fabric and can sleep hot for some, trapping in heat the body releases throughout the night.
While both generally don't differ greatly on this, satin is slightly thicker and heavier, so it will breathe a little less. It's also important to note that silk absorbs humidity and moisture very well, so this will absorb any sweat you may produce in your sleep.
Pajamas made from natural materials like silk are ideal sleepwear choices. Silk can also allow your skin to breathe. It's best not to wear socks to bed if you don't need them. This can increase your chances of sweating.