We ordered a Medium size STX Shield 400 chest protector for our 5/6 grade boys team. The goalies on our team average a little over 100 pounds, and the chest protector fit well. The protector has adjustable Velcro straps that allow for additional sizing. The item is made well, comfortable, and offers sturdy protection from the shoulders down to the waist line. The protector has an adjustable pad that helps cover the lower portion of the stomach. We are pleased that the chest protector provides the mandatory heart protection as well.