A foot support for a prosthetic boot has a shape-holding layer and cushion layers on opposite sides of the shape-holding layer. Covers made of nylon and vinyl laminates surround the layers. The vinyl laminates are fused by welding edges of the cover around the foot support. The edge welding surrounds the foot support. An inner parallel welding holds a valve and forms an inflation passage. The inner welding continues around concave curved edges of the shape-holding and cushion layers and terminates where it rejoins the outer welding, forming an inflatable tarsal and metatarsal supporting chamber. A small hard pump has two ends to either increase or reduce pressure in the supporting chamber.
