They are designed for a maximum weight of 125 pounds, 57 kilograms, or 9 stone depending on which you are most familiar with.
They are roughly equivalent to boys size 12 or 14 which is at the most a 29 inch waist or 73 cm.
If you weigh under 125 pounds and have less than a 29" waist they will fit, I am assuming you are a guy. Also due to male anatomy it will be tighter fitting if you are an adult by default. If you are a girl then hips will be a major factor.
With a 44 inch waist you have no chance in my opinion, I would not advise trying L-XL or 8-15 Goodnites/Drynites if you have if your waist is larger than 31" or so and even then if you weigh more than 125 they will not work as the manufacturer intended even if you can get them on.