Bought the happy seat its self with out the thruster to to help keep my knees in place. But it provide very little support because the bag is too small. It needs to be a lot wider and taller. Ended up put big foam blocks under the bag to raise it up.
The happy thruster adds more volume than any other over thruster on the market. It is a little pricey, but it beats frequent trips to Walmart to replace your beach ball. A must have for all playboaters.
To increase the life, immediately aquaseal the joints where the hose connects to the bag. Also, always let some air out when you are not using it. Never keep it fully inflated in the sun or during travel or else a seem may blow out. If you take care of it, it will last for years.
Jackson Kayak's Happy Seat/Thruster Combo optimizes the performance of your freestyle kayak. The Happy Seat will lock your legs into place and the Happy Thruster will increase the deck volume of your kayak for more 'pop'.
Jackson Kayaks' Happy Seat Thruster Combo Features: