Gel Cushion for Remote Work, Desk Work, Lower Back Pain Relief, Postpartum

My previous gel cushion, used for back pain relief, became worn out, so I purchased a new one. However, due to its 3cm thickness, it no longer aligned with the height of my armrests and table, which ironically seemed to be worsening my back pain. Reluctantly, I've decided to sell it.
I used a cover with the cushion. The cover has anti-slip features on the underside.

[Relaxing Home Goods] Items to help you relax comfortably at home. Suitable for various sitting positions such as seiza (formal kneeling), agura (cross-legged), and athletic squat. Recommended for larger individuals as well. Protects your precious floor and hard chairs.
[Supreme Cushioning] The thickness provides significant body pressure dispersion. The gel's elasticity offers a floating sensation, making it comfortable to sit for long periods without buttock pain. Can also be used as a floor cushion.
[Breathable Gel Cushion] This popular honeycomb structure gel cushion features a double-layered honeycomb design. Combined with the cooling sensation unique to gel material, it offers excellent breathability. This gel cushion is significantly less prone to stuffiness compared to conventional cushions.
[All-Season Cover Included] Comes with both a summer and a winter cover, ensuring comfort for both those who feel the cold and those who feel the heat. The cover is also removable for easy cleaning, keeping it hygienic at all times. The anti-slip processing on the underside helps maintain correct posture.