Ergonomic K-Med leverage bracing support chair Using leverage principle to support your back and maintain proper posture, reduce strain on your lower back and spine. The K-Med chair supports your pelvis, lower back and back simultaneously with a spherical bottom and an elastic back to keep your spine straight no matter what your posture. Ideal for students, teachers, office workers, gamers, and anyone who is sitting for long periods of time. It is also recommended for people with back pain or spinal stenosis. This product is designed to support your lower back and spine. Not intended for comfort. Self-reinforcing structure. The tightness is not small in size, but to protect the body. K-Med chair uses polyamide resin for a stable and resilient body. * Size - Large Size: 435W x 315D x 315H mm * How to Use: Step 1: Place the product 12.7cm(5") away from the back of the chair. Step 2: Press the waist and hips into the product and use it. The K-Med chair provides support while you sit down. Step 3: Using the principle of leverage, supporting the lower back and back.