Pacific Trail Mens M Medium‎ Plaid Vented T-Shirt Outdoor Button Up

Pacific Trail Mens M Medium Plaid Vented T-Shirt Outdoor Button Up In good condition no stains or holes. There is something on the back right of shirt. Its not a hole. Not exactly sure how to describe it but I have provided a picture. If you have any other questions please ask! Thank you. Dimensions- Pit to pit: 20 Length: 30