In principle, the sole can be used many times. We assume that the heat-producing base material can be compressed in the order of about 1 - 1.5 million times until it "goes flat". Assuming you make about ¾ meter per step, this gives an order of magnitude of 2 x 1,000km. However, depending on the condition of the shoe and socks, the upper will be worn down over time. Please note that a sole is quite "maltreated" by the feet and the shoes and therefore also from this side wear occurs over time.

Intensive use, we have also already noticed that the upper or lower material comes loose. With a simple iron or an ironing press (without steam and with a cloth between the material and the iron), the material can be partially "ironed on" again.

The chili-feet soles adapt to the shoes by taking and maintaining the shape of the shoe bed. So the sole does not bulge, but lies optimally in the shoe. Since the sole does not have a fixed arch, it is suitable for any type of shoe. The sole also adjusts accordingly after changing into a new/different pair of shoes. The soles of chili-feet are thus suitable for any shoe and foot shape.

The chili-feet are not ideal for alpine skiing. Our extensive tests have shown that you tend to move too little in terms of time when alpine skiing. The insulation effect also gained with the sole is there, but the heat production is very low. The heat production only occurs when one runs and thus permanently presses on the soles and relieves them again. This is less the case with alpine skiing. The effect is therefore only limited and from our point of view too little noticeable. This is different when snowshoeing, cross-country skiing or walking. There chili-feet unfolds the effect best.

Because the soles convert the pressure of body weight into heat, a certain minimum weight is required. The benefit of the thermal sole is limited to the insulating effect when the weight is less than 48kg. At a lighter weight, the heat production is significantly lower. Whether a noticeable heat is produced at, for example, 35kg, has not yet been tested.

This cannot be assessed completely conclusively, as the sensation of warmth is always also a subjective sensation. However, since the pressure point when cycling is primarily at the front of the ball of the foot, it is quite conceivable that a warming effect occurs. The toes, on the other hand, are the most exposed area and hardly any pressure is exerted during cycling, which means that hardly any heat is produced. In this case, it is especially recommended to use the 5mm sole, since this produces quite a bit more energy than the 3mm heat sole.

The chili-feet can be cut with normal scissors. The cutting has no negative impact on the functionality of the thermal sole.

Each package always includes a pair of soles, so for the left and right shoe.