One aspect of the invention provides a prosthetic foot including a heel member, a toe member, and an attachment member comprising a shear thickening material (STM). In one embodiment, the attachment member has a first end and a second end. The first end can be connected to the heel member, and the second end can be connected to the toe member. In another embodiment, the attachment member further comprises an elastic polymer. In one instance, the elastic polymer is impregnated with the STM. In yet another embodiment, the attachment member further comprises an elastic reservoir. The elastic reservoir can contain the STM. Alternatively, the attachment member further comprises a rigid reservoir. The rigid reservoir can contain the STM.
