The RS Zest is a compact centerboard dinghy with a length of 3.59 meters (11'9"), a beam of 1.47 meters (4'10"), and a hull weight of 73kg (161 lbs). It has a sail area of 6.9 square meters (71.5 square feet) and is made of Comptec PE3 durable polyethylene. The main sail is a 5.7 square meter (59 square feet) Dacron sail with reefing, and the jib is a 1.2 square meter (12.5 square feet) Dacron sail. The maximum crew weight is 225kg (496 lbs)