XGO® was the first engineered system of next-to-skin layers designed to be worn as standalone pieces or as part of a layering system. The XGO® Phase 1-4 product system maximizes your body’s natural temperature regulation, and dissipates moisture more effectively than anything else on the market. All construction and seam placements have been carefully designed to maximize comfort and freedom of movement, thus minimizing the grind on load-bearing anatomies.