A prosthetic foot comprising: an ankle module (1100, 1120) configured to be coupled to a lower limb member; an elongate foot member extending from a proximal end to a distal end, the proximal end of the elongate foot member coupled to the ankle module; and an elongate lower foot member extending from a proximal end to a distal end, wherein the lower foot member is positioned below and coupled to the foot member, and wherein the lower foot member extends distally beyond the distal end of the foot member to form a toe region, wherein the ankle module is selectively actuatable to adjust an angle between the prosthetic foot and the lower limb member to allow for adjustment of a heel height of the prosthetic foot, and wherein the toe region curves upward and is configured to adapt to various heel heights of the prosthetic foot, and characterized in that the ankle module comprises a hydraulic adjustment mechanism comprising: first and second pistons (1142, 1144); a central cavity between the first and second pistons; a hydraulic fluid in the central cavity; an intermediate wall separating the central cavity into first and second cylinders (1146, 1148); a spool valve extending through the intermediate wall, the spool valve actuatable to selectively place the first and second cylinders in fluid communication; and a ball lock actuatable to selectively place the spool valve in an open or closed position, the ball lock comprising a first end portion, one or more balls, and at least one spring. an ankle module (1100, 1120) configured to be coupled to a lower limb member; an elongate foot member extending from a proximal end to a distal end, the proximal end of the elongate foot member coupled to the ankle module; and an elongate lower foot member extending from a proximal end to a distal end, wherein the lower foot member is positioned below and coupled to the foot member, and wherein the lower foot member extends distally beyond the distal end of the foot member to form a toe region, wherein the ankle module is selectively actuatable to adjust an angle between the prosthetic foot and the lower limb member to allow for adjustment of a heel height of the prosthetic foot, and wherein the toe region curves upward and is configured to adapt to various heel heights of the prosthetic foot, and characterized in that the ankle module comprises a hydraulic adjustment mechanism comprising: first and second pistons (1142, 1144); a central cavity between the first and second pistons; a hydraulic fluid in the central cavity; an intermediate wall separating the central cavity into first and second cylinders (1146, 1148); a spool valve extending through the intermediate wall, the spool valve actuatable to selectively place the first and second cylinders in fluid communication; and a ball lock actuatable to selectively place the spool valve in an open or closed position, the ball lock comprising a first end portion, one or more balls, and at least one spring. first and second pistons (1142, 1144); a central cavity between the first and second pistons; a hydraulic fluid in the central cavity; an intermediate wall separating the central cavity into first and second cylinders (1146, 1148); a spool valve extending through the intermediate wall, the spool valve actuatable to selectively place the first and second cylinders in fluid communication; and a ball lock actuatable to selectively place the spool valve in an open or closed position, the ball lock comprising a first end portion, one or more balls, and at least one spring.