The NIKE THERMA-FIT Repel Synthetic Fill Running Jacket in Blue Void and Thunder Blue harnesses advanced thermal technology to regulate body heat during cold-weather training. Nike's proprietary Therma-FIT system works with your natural warmth to maintain optimal core temperature, whilst the woven, water-repellent fabric provides reliable protection against light rain and snow. Strategically perforated synthetic insulation delivers exceptional warmth without sacrificing breathability, allowing moisture to escape during intense efforts. The engineered construction ensures you stay comfortable and dry across varying conditions, making this jacket an essential layer for serious runners committed to year-round performance.