Of course they can be washed, but only the outer sleeve. All our models have two covers, one inner and one outer, so you can easily wash the outer cover of the heat pack without fear of getting the seeds and flowers on the inner cover wet. By simply removing the outer cover, you always have it clean and ready for use
As it is a 100% cotton fabric, there is no great mystery about how to wash it, as it is a fibre that is easy to handle and very resistant to both hand and machine washing. You can wash the cover in warm or cold water, but if the temperature is too high (above 60ºC / 140 °F) it may lose its colour and shrink a little; we recommend temperatures of no more than 40ºC (104 °F).