Premium Alutherm felt inserts for warm feet Do you always get cold feet quickly in winter and want to do something about it? Do you have tiled floors at home and walking over them is often too cold for you? Then our Alutherm insoles are just right for you. Our insoles are built in three layers. The bottom layer is made of a specially developed layer of aluminum, which is only there to protect the feet from the cold from the ground. The next layer is made of foamed polyurethane, which dampens the crotch and thus ensures comfort when walking. The last and top layer of the insole is made of high-quality felt, which makes the sole even softer and more comfortable. In addition to the usual warmth, our insoles also ensure good blood circulation, so that your feet can compensate for the temperature differences more easily. Details: Material: 65% felt, 27% polyurethane, 7% aluminium Thickness/height: approx. 7 mm