The Standard Size unit is 5 feet by 4 feet with a 3 foot by 4 foot landing mat (12 square feet). Weight is approximately 130 lbs. The Large Size unit is 6 feet by 4 feet with a 4 foot by 4 foot landing mat (16 square feet). Weight is approximately 157 lbs. It is recommended that if the majority of use of the VertiMax is going to be by athletes 6’3″ and taller, you should train on a large size.