Background
Footwear with a curved sole profile remains popular and there is evidence of its effects on gait and posture [1, 2]. Existing literature describes how different styles of roll over footwear affect gait, although the effects of the precise radii of the curve of the sole on the gait rocker function and other reported effects have not been investigated. The aim of this study was to relate the radii of the soles of two roll over footwear products to their effects on walking.