Cotton, known for its softness and breathability. The concept behind a cotton weighted blanket is rooted in deep pressure stimulation, which has been associated with relaxation and improved sleep. The evenly distributed weight is believed to promote the release of neurotransmitters like serotonin and dopamine, contributing to a sense of calmness and well-being. Cotton, as the outer fabric, enhances the overall comfort of the blanket, making it suitable for year-round use.