For the ultimate in patient comfort and durability, look nowhere else. I believe this is a size 9 as the person this was for was 5ft6/5ft7 and the girth is 120cm so that should be a size 9. Check the sizing chart in the photos.
Glove Airflow Sling Size 7 Care & Independence medical sling carrier up to 200kg
Glove Airflow in-situ Sling Size 9 Care & Independence Body Temperature Comfort
Care and Independence Glove Airflow Sling
Neo-G Arm Sling for Shoulder Injury Arm Injury Recovery, Pre/Post Surgery - Airflow Breathable Lightweight Shoulder Sling - Adjustable Straps - Class 1 Medical Device