The Leckey Squiggles Early Sitting System (ESS) is a 3-in-1 sitting system designed to provide support in sitting for children up to 4 years and 40 pounds with mobility and physical disabilities. The Leckey Squiggles ESS encourages 3 different types of sitting: 1. Dynamic Sitting – providing support to the trunk that moves with user's movements (this is a side view); 2. Long Sitting – sitting with legs out straight, often used to help stretch out the hamstring muscles on the back of the legs; and 3. Prone Sitting – positions the seat surface with a forward tilt to help promote an anterior pelvic tilt to encourage sitting upright. The ESS was designed to be lightweight and compact to promote portability. It’s a system that can be moved from room to room at home or at school. There are also attachment straps that allow user's to secure it to most chairs for more versatility. The ESS is designed with a contoured seat surface and a 4-point pelvic belt to provide a stable surface to sit on. The dynamic trunk support is then secured around the trunk to provide support for the upper body. Because of the dynamic feature, it can allow upper body movement to help users work on functional movement while in a seated position. The dynamic feature can also be locked out to prevent this movement for new sitters until they are ready for this challenge. OPTIONS: ESS Abduction Pommel, ESS Leg Support, ESS Prone Bar, ESS Flexion Roll are some of the features available for the Leckey Squiggles Early Sitting System to promote an optimum sitting position. SIZES: One Size. DIMENSIONS: Maximum User Height 39.5" (99 cm), Seat Width 5.9-7.9” (15-20 cm), Seat Depth 7.5-10” (18.75-25 cm), Dynamic Trunk Support Width 6.3-11.6” (16-28.75 cm), Dynamic Trunk Support Height 7.5-10” (19-25.5 cm), Dynamic Trunk Support Angle Adjustment 75-115 degrees, Lap Belt 20-22.5” (50-56.25 cm). CAPACITY: 38 lbs. COLOR: Yellow. WARRANTY/GUARANTEE: As stated by the manufacturer.