Grabber Warmers, full foot, small/medium. 1 pair insole style. Sizes: Ladies 5-8 / mens 4-7. Heats for up to 5 hours. These air-activated warmers start heating in just a few minutes after the package is opened - no shaking or kneading required. Great for skiers, snowboarders, hunters, campers, and anyone suffering from health-related cold hands, these hand warmers enhance your enjoyment of outdoor winter activities.