Every Oro Sports product comes with CoolPaks™. To order extra, click here. Our original Maximo™ Cooling Vest is perfect for core cooling during low-level activities. Elastic side panels connect the front of the vest to the back -- unlike our Maximo Gen2, that has no side panels. This means a more secure fit when it comes to body movements. This style is recommended for recreational, leisure, and symptoms management. Sizing for the Maximo™ Original varies from our Maximo™ Gen2, so please refer to the size chart before ordering. We ask a lot of our engineered textiles, yet they deliver on all counts: Moisture management Antimicrobial Super lightweight Breathable Lifetime performance High-tech aesthetic No other brand matches our quality constructions or MADE in the USA commitment. If you have questions about sizing, contact us today... even if today is Sunday. We do our best to return every call within 24 hours.