【Improve Posture & Relieve Back Pain】 – Recommended by physical therapists and chiropractors, our yoga ball chair for office can improve your sitting posture, strengthen your core muscles, and reduce lower back pain to encourage a healthier lifestyle. 【Stability and Safety】- Our yoga ball chair is made of non-polluting and hypo-allergenic material; rated up to 330 lbs. The base keeps the stable ball from rolling around. The 65cm exercise ball is recommended for customers 5'3” to 5'10” in height 【Anti Burst & Slow Deflation 】- Our ball chair is made with the honey comb structure; when being punctured by sharp objects,the ball will slowly deflate within 3-5 seconds.No abrupt explosion to reduce the chance of injury significantly 【Inflation Instructions】- Inflate the ball to about 80% of the recommended size firstly; leave on for 1-2 days, then inflate to the recommended size. Ensure the air plug is pressed flush with the ball surface to prevent air leakage. Inflate the ring base in the same way as for the ball; only 30 to 40 pumps to reach perfect condition 【Thoughtful Wellness Gift】- This ergonomic yoga ball chair relieves discomfort & enhances posture naturally. Made with safe materials, it encourages active sitting for daily comfort. A meaningful gift to support loved ones' health journey. yoga ball chair with base stability fitness ball seat for home office pregnacy ball chair workout ball exerciser ball chair