So Danca AC30 Flex Kit

Progressive Resistance. Dynamic Flexibility. Active Strengthening.  

Strength Made Convenient 

No longer do you need to manually manipulate stretch bands with your hands to exercise your feet. With flex, resistance stems from your hips and legs. With an adjustable waistband and leg straps, you can set your exact level of intended resistance depending on your exercises, leg length, and flexibility. Flex offers three levels of resistance bands. As you develop your strength, and explore new ways of exercising your toes, arches, and ankles, you can swap out these bands for new challenges. It’s time to take stretching and strengthening to a whole new level. Stay flexy!