Flexible members are provided that define (i) a toe platform region, (ii) a longitudinal arch pad region, (iii) a heel region, and (iv) a center axis； and include a plurality of fiber layers of varying lengths. The fiber layers each include a plurality of unidirectionally aligned fibers that are angled at between about 10° and 20° relative to the center axis such that the plurality of unidirectionally aligned fibers are angled medially from the heel region to the toe platform region. The flexible members may be used as orthotics, orthotic inserts or as an orthotic footplate that is joined with respect to a brace structure to function as an ankle foot orthosis. The flexible member improves biomechanical function, including biomechanical function of the foot, ankle and knee, and advantageously imparts propulsive force in connection with a user's gait by storing and releasing an individual's own energy to assist in walking and/or standing.
