The Hybrid Cooling Vest by TechNiche International was designed with both of their cooling technologies for the athlete who needs to stay cool regardless of the activity. With their patented HyperKewl™ Cooling fabric and Cool Pax ™ phase change cooling technology athletes no longer have to worry about the dangers of heat stress and heat fatigue and can focus on their sport. The HyperKewl fabric provides 4-10 hours of cooling relief at up to 15°F from the ambient temperature while the Cool Pax provide constant 58°F of targeted temperature of cooling relief. Research shows the benefits of wearing a cooling vest pre, post and during exercise and this is the reason many professional athletes and Olympic teams choose the Hybrid Cooling Vest as their training aide of choice. Include one (1) set of CoolPax PCM Cooling Inserts (7065V w/velcro), one (1) vest and one (1) cooler bag. Materials: Comfortable quilted nylon outer with HyperKewlTM fabric inner, water repellent nylon liner and black poly-cotton trim with 58°F Phase Change Cool Pax.