This cushion improves your seating posture while providing back support and comfort. It conforms to provide support to your lumbar region and has a sealed liner that protects the foam core from moisture. The stabilization board secured on back of foam core prevents hammocking in sling-back wheelchairs. This cushion also has a non-slip vinyl back to prevent it from sliding. It has a weight capacity of 300 lbs and comes with an 18 month limited warranty on the cover and cushion. The HCPCS suggested code for this cushion is E2611. Notice to California Consumers: WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.