The resistance to cold injury hypothesis claimed that dark skin was selected against in cold climates far from the equator and in higher altitudes as dark skin was more affected by frostbite.[29] It has been found that reaction of the skin to extreme cold climates has actually more to do with other aspects, such as the distribution of connective tissue and distribution of fat,[30][31] and with the responsiveness of peripheral capillaries to differences in temperature, and not with pigmentation.[4]