Slimline cushion with unique dual gel sac system The Invacare Flo-tech Solution cushion uses a combination of a slim, shaped foam cushion base and a dual layer of pel sacs over the ischial and sacral area. The dual gel sacs and the unique moulded foam shape of the solution increases the support surface area. This delivers a superior level of protection for those patients identified as being at Very Hiqh Risk of developing pressure ulcers, or for those with already established tissue damaqe.