1. The children can use warmer when they are at school, warmer can also be posted on the knee or put into their pocket, so, they can't concentrate on class lectures owing to clod weather!
2. The old people are afraid of the cold in winter, if you buy some warmer for the old, the elderly will feel close and practical, warmers are posted on the waist and knees, they would never feel cold and pain! In fact, warmer is regular goods for the elderly !