This vest is designed to be pulled snug against the child's body, providing proprioceptive deep pressure feedback and stability over the chest and waist- The vest is made of two separate pieces, front and back, that attach with wide strips of hook-and-loop fasteners- That allows the therapist to adjust and vary the dimensions to meet the needs of different children- It is made of Airprene, a material that has tiny perforations throughout the fabric to reduce overheatingFeaturesWeight Set for Weighted vest.Includes 8 Pieces.Item Weight - 4 lbs.