New bodily cooling techniques are provided. In some aspects of the present invention, a new rapidly-evaporating cooling gel or fluid is sprayed or doused over or about an athlete's body and/or worn garments in thermal-reduction-optimized gravitational, diffusion and movement-induced patterns, to maximize cooling during exercise. In some aspects, a worn garment may serve as the matrix or platform for this distribution of the fluid. In other aspects, tuned, heat-absorbing port-controlling devices cause the release of the cooling gel or fluid from distribution tubes or other channels (e.g., integral to the flexible fabric itself) upon local underlying body heat exceeding a threshold, and resealing (halting release) upon body or regional heat dropping below a threshold. In still other aspects, heat-expanding sub-elements rise away from a body heat source toward a wider region for heat release, while other cooled sub-elements descend and exchange places with them, to absorb more body heat.