The Reebok Easytone Go Outside II uses the in-built balance pods to create a natural instability whilst walking or gently moving. This increases muscle activation to tone your glutes, calves & hamstrings by up to 28% more than without wearing them. The Smooth Fit technology adds comfort with its flexible seamless design & the anti-bacterial breathable lining keeps your feet cool. Whilst the removable sock liner adds cushioning for the foot, it also accommodates orthotics.