Shoes for chronic venous insufficiency (CVI) should be lightweight, have a low heel to improve calf muscle function, and offer adjustable closures for swelling. Key features include cushioning, breathable materials like mesh or leather, a wide toe box for comfort, non-slip outsoles for stability, and removable insoles for customization. Avoid high heels, pointed toes, and restrictive footwear that can hinder blood flow and worsen CVI symptoms.