Almost invisible! Flexible and easy to use, this support design is split in the middle for simple on/off. This chest support is designed to be comfortable and extremely durable. It offers positioning for individuals that benefit from having their upper body stabilized and hips held at a proper angle. It can be used with most standard, high back, or custom wheelchairs and strollers. Sizes (measure seated, shoulder to hip) Infant: 6"-8" X-small: 8"-10" Small: 10"-14" Medium: 14"-17" Large: 17"-20". Please see frequently asked questions, #19, for strapping options. If no option is chosen, standard strapping will be sent. Please Note: This product is not a restraint.