Discussion: Wearing track pants can cause heat injury?

It is "amazing" how i was told that wearing track pants can cause heat injury as it traps heat in the legs especially for long-distance run..

If that's the case, why do army trainees wear Long 4 for route march? It has much higher risk of heat injury, right?

Is the person who told me about the "danger" of wearing track pants forgetting the fact that the key to avoiding heat injury is proper hydration? And isn't that why they have water points along the route for the long-distance run?

Haiz.. as for now, i'm compelled to wear shorts for morning runs.. already we are wearing singlets.. i feel naked..

Wallaahu al-Musta'an.