This listing is for the size L, the M sold. Firm price, no haggling. Only used a couple of times. From site: Invisible built-in belly support band alleviates heaviness and decreases pressure on the pelvic floor to ease abdominal and round ligament pain and leave you feeling snug and secure. Varying degrees of compression create targeted support whilst the flexible belly panel expands with you for the perfect balance between support and comfort. X-shaped reinforcement eases back ache while encouraging proper posture keeping you motivated and energized.