This is a great value set of two! The color will be light gray. We will ship them in the package shown in photo 9. Since it's a set of two, we will put the two chairs in a black plastic bag for shipping. Thank you. 【AI-Driven Next-Generation Posture Correction Revolution】 ① ＜Collection and Analysis of Human Sitting Posture Data＞ We collected human data from 5,000 cases and, using motion capture, pressure sensors, and 3D scanning technology, analyzed in detail the changes in posture of the spine and pelvis. ② ＜AI Analysis and Optimization of 3D Support Surfaces＞ An AI algorithm performs deep learning to identify posterior pelvic tilt, spinal curvature, and shifts in the center of gravity. Then, simulations are used to optimize the 3D support structure of the chair, supporting a healthy S-curve and preventing slouching and forward leaning. ③ ＜Verification of Comfort and Corrective Effects through AI Simulation Testing＞ Finally, pressure tests are conducted using virtual human simulations by AI. 【Keeps Your Back Straight! Maintains an S-Curve】 The angle and height of the backrest and seat are ergonomically designed to perfectly support three important points: the buttocks and lower back. The W-shaped design placed near the base of the thighs effectively supports the pelvis using the principle of leverage, and the shape that envelops the buttocks naturally guides you to the correct posture. 【Thoughtfully Designed Structure for Supreme Comfort】 Comfortable seating at all times without trapping heat. 『Memory Foam』Type: The backrest and seat with just the right firmness and thickness support the pelvis while maintaining the S-curve of the spine.