SPIO Compression Shirt - Short Sleeve It is deal for those with Hypotonia, Cerebral Palsy, Down Syndrome, Athetosis, Rett Syndrome, Autism, and Sensory Processing Disorder. Stabilizing Pressure Input Orthosis (SPIO) assists patients with stability and proprioceptive deficits through deep pressure. Since deep pressure appears to be an important somatic input for balance and movement control, SPIO is designed to provide and enhance deep pressure sensory input around and toward the midline of the body to improve dynamic stability and postural activation. SPIO provides even circumferential deep pressure throughout the area of the body that it covers.