This RelaxMaternity Baby boys & girls vest is produced with natural Milk fiber, which has deep moisturizing properties and makes the skin smoother and healthier. It is extremely soft, hydrating, breathable, fresh, and ideal to avoid dehydration of babies' sensitive and delicate skin. It does not provide any type of compression, while its flat seams prevent rashes and irritations and guarantee maximum comfort and perfect fit. The RelaxMaternity baby vest is also perfect throughout the first three years of your baby's life: it fits girls and boys from 6 to 36 months and molds to the baby's body while growing up, thus allowing you to save both money and space in the drawers. Fabric content: 40% viscose, 37% cotton, 12%nylon, 7% milk fiber, 4% elastane