Beat the heat with the Mobile CoolingA(R) HydrologicA(R) Vest-trusted by outdoor workers, athletes, and adventurers alike. Powered by HydrologicA(R) evaporative cooling technology, this vest uses a Super Absorbent Polymer (SAP) quilted liner to retain water and deliver hours of cooling comfort. Simply soak for 1-2 minutes, wring out, and wear over your shirt. As water evaporates, it pulls heat from your core-helping regulate body temperature and keep you going in high-heat environments. Lightweight and low profile, it layers easily under protective gear or over casual wear. Optional 3-phase Cooling Ice Packs can be added to boost performance during extreme heat.