DESC: 55 cm Red FitBALL Sport Soft Exercise BallThe burst-resistantFitBALL Sport Soft Editionexercise ball has a comparable feel as the premiumOriginal FitBALLexercise ball, but at a lower price for greater value. It is the perfect balance between soft and firm for optimum comfort. TheFitBALL Sport Soft Editionis weight tested to 600 lbs. and made from a unique burst-resistant material that resists tearing if punctured for maximum safety. It is latex-free with no strong chemical smell.Click Here To View More Exercise Ball Selections - Original FitBall, FitBall Sport Firm, Gymnic Therapy Exercise Ball, Sit N Gym, MoreSUGGESTED SIZING GUIDELINES- When sitting on the exercise fitness ball, your knees and hips should approximate a 90 degree angle or slightly higher. Here are some general guidelines:4'8" to 5'3" --55cm5'3" to 6'0"-- 65cm6'0" to 6'7" --75cmChart is intended for general guidelines only. Please consult your therapist or trainer for your specific needs. If your height is between th