The outer side of the stitch mattress protectors is made of 100% cotton fabric and polycotton. Filling is made of hollow siliconised PES fibre that suspends dust mites, does not retain smell, does not create dust and secures a completely healthy ambient. Stitches keep the filling contained and the volume while washing, contributing to your relaxed sleep. The rubber bands keep them tightly fit to the mattress. Maintenance is easy with machine washing (60°C).