Below answer to your question taken from
www.zeintec-usa.com
How much does the Zeintop weigh?
The complete top weighs approx 99 lbs (45 kg), including the glass and insulations/interior lining. Light enough for two people. However, when you take into account the weight reduction with the removal of the rear trunk and soft top lids, the net weight becomes only 65 lbs (29 kg) for the 986 (’97-’04) Boxster.