Like all other aim'ns, you should wash at a maximum of 30 degrees and without fabric softenerOur pajamas are made of luxurious viscose, which resembles silk and is light and airy. Viscose absorbs a lot of water and the risk of shrinkage is therefore greater if you wash it too varm.If you feel that the product shrinks during washing and want it to return to its normal length is to iron it softly in correct temperature. Your own body heat will also help and also works well to remove wrinkles :)