From the function points, tropical boots, warm boots, cold boots, these three categories, just use the different types of military services will be different
Tropical boots, also known as desert boots, mainly emphasize the maintenance of foot dryness and comfort in high temperature environment. The lining is either single-layered koura fiber/special nylon cloth. If it is better, it will be replaced with super lining or coolmax. Such as sweat-absorbent and quick-drying materials; jungle boots are the ancestors of tropical boots from some performances, but jungle boots may enhance the quick-drying performance.
The warm-up boots emphasize the waterproof and breathable nature in a humid and rainy tropical environment. They are made of Gore-tex lining and are effectively waterproof for 4-6 hours. They can be regarded as products between jungle boots and flying boots and desert boots. Can be used in the desert environment, but the comfort is not high, more suitable for multi-water environment and the driver (the cockpit environment is not comfortable, the feet are not moving often, this kind of boots is very easy to use); but not suitable The water depth exceeds the environment of the upper, and it is difficult for such boots to dry out in a short time after entering the water.
The cold boots, based on the temperate boots, add warmth, enough to cope with the low temperature and the accumulation of water after the melting of snow and ice, but also suitable for the pilots (mainly bombers) to keep warm at the height of the feet.
If you add performance classification, at most, there are multiple steel heads to improve safety or lightweight series made of new materials, and flame retardant type made of flame retardant materials (but most of the materials of military boots are flame retardant). In particular, it is not limited to this point; adapt to the changing terrain, such as the mountain boots developed by the mountain environment, or the special style soles, but this is more common in foreign troops.