Tunturi T-Flex™ is an ingenious running base not to hard and not to soft. Tunturi T-Flex™ combines rigidity and joint saving cushioning. The rock solid deck is attached with soft side bumpers and tightly coiled hevy duty springs. The result is a running base with no side movement and directs all kinetic energy into a vertical movement. Tunturi T-Flex™ combines Top ergonomics and dynamic treadmill training from walking to a full sprint. Safe joint saving comfort with the Tunturi T-Flex™.