The generic idea is cooling "pulse points", i.e. places in your body where the blood flow is nearest to the skin. Surely the femoral artery is one carrying a l

The generic idea is cooling "pulse points", i.e. places in your body where the blood flow is nearest to the skin. Surely the femoral artery is one carrying a lot of blood, so cooling it is more "efficient" than whole body or other pulse points (you need less water).