I love how it works. Now you need to be realistic base on your environ. I am in Montréal, this mean i can use them in the morning to let the baby at kidengarden and the evening to take them off. Also it's not about go take the baby in the city and then stop by at the pharmacie, it won't work. If you understand the environnement you are in and the usage and limitation it have, this is super usefull and fun