The body sock is excellent for providing calming deep pressure input and for developing spatial and body awareness. It helps people to explore the three-dimensional space they occupy and help with spacial awareness through balance and resistance. Great for people who seek deep pressure. A wonderful OT tool for people who have autism, ADHD, or sensory integration challenges. Made of a machine washable, 4 way stretchy spandex material. There is an opening in the back for the person to climb into it. Can be used with head inside or outside. You can see right through the fabric. The best size is as close as possible or slightly shorter than one's height– please refer to the sizing chart below: xsmall - 34" long x 22" wide $35 (fits 35-41"), small - 40" l x 24" w $40 (fits 39-46"). medium - 47" l x 26" w $50 (fits 49-55"), large - 56" l x 29" w $60 (fits 55-62"), x large - 66" l x 31" w $70 (fits 66-73"), Xx large - 76” l x 31” w $80 (fits 76”-83”).