Nowadays, the field of smart textiles is growing steadily. Smart textiles are commercially available in various applications, such as sports, healthcare, automotive, military, personal protection, security, and space exploration. This is the context for the product developed by start-up H-Cube which designs, manufactures, and markets high-tech clothing. More specifically, the proposed technology aims to transform a traditional garment into a useful active element for monitoring the health state of the user. One of the main problems for these smart technologies is washability; indeed, it affects both the electrical properties of the constituting materials and the functionality of the product. For this reason, it is important to carry out a careful analysis of the effects of washing processes.