When sourcing, prioritize 100% aromatic Red Cedar (Juniperus virginiana). This specific wood type is essential because it naturally absorbs moisture, neutralizes odors, and repels insects. Ensure the wood is unvarnished and finely sanded; a lacquer finish will block the wood's porous ability to absorb sweat. For the design, a split-toe (adjustable toe) with a spring-loaded telescopic tube is superior to solid designs as it provides lateral and longitudinal tension, maintaining the shoe's original shape more effectively.