Brand new, in never-opened box. Reason for selling: Bought new CPAP machine that came with this mask, one of which I already own. Size - Medium. To find your size, template at this site: https://www.resmed.com/en-us/sleep-apnea/sleep-blog/airfit-f20-how-to-measure-your-ideal-mask-size-at-home/. Location - Chemainus, BC $125 CDN