Using the swaddling technique (applying a gentle, constant pressure), the ZenDog Calming Shirt provides a drug-free way to calm and soothe pets with anxiety and nervousness. The ZenDog Calming Shirts activate the pet's pressure points to help calm even the most anxious dogs. The lightweight 4-way stretch fabric applies gentle pressure and can be worn all the time. This Adjustable custom fit shirt is machine washable and can be used as a cooling garment when wet. Lightweight, breathable fabric is comfortable for your pet to wear.