This is a US size 10, Aus size 16 and a Euro size XL

This would fit someone around 160 pounds. 

Used only a few times and in pristine condition. 

More than 25% of body heat is lost through the head and extremities of the body. The vest with hood design provides the best insulation and protection for colder dives. The hood protects against chaffing from mask straps, keeps your head and ears toasty warm, and is flexible enough to slide off if required, while still remaining comfortable. The hood allows better hearing and less chance of ear squeeze than traditional neoprene hoods.