Occunomix Slim Style Miracool Phase Change Vest - Black. Features: Fitted Phase Change Vest with 4 Slim Style Packs Keep Cool up to 3 Hours once activated Extended Length Vest with Stretch Side Panels for secure, close to the body fit Front Zipper - Easy on, easy off Ox Cooler Bag Included Sizing: M/L-2X/3X Occunomix Slim Style Miracool Phase Change Vest - Black