Grabber Warmers, full foot, medium/large. Box of 30 pairs. Insole style. Sizes: ladies 9 / mens 8 . 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.