Official SM SuperM Baekhyun black t-shirt. 100% cotton. NWOT and never worn - it's been displayed on a merch shelf since I bought it, and it never had a hangtag. One size (I'd say it's similar to a men's / unisex large). Measurements: Pit-to-pit: 23" Here's how to use the AR tech for this shirt: Apple APP STORE Download link : https://apps.apple.com/us/app/superm-ar/id1480518766 Google Play store Download link : https://play.google.com/store/apps/details?id=com.sm.superm - DOWNLOAD THE SUPERM AR APP TO YOUR MOBILE DEVICE. - START UP THE APP AND SELECT YOUR T-SHIRT. - SCAN YOUR SUPERM AR T-SHIRT BY FILMING CLOSE TO THE PRINT ON THE TEE. - THE AR VIDEO WILL PLAY ONCE THE APP HAS SCANNED.