When evaluating a 3-layer shoe cabinet, prioritize material durability and structural stability. For wooden units, ensure the use of E1 or E0 grade MDF/Particle Board to meet formaldehyde emission standards. If sourcing metal racks, verify powder-coating thickness to prevent rust. A critical specification is the tipping bucket mechanism; look for nylon or high-strength ABS plastic brackets rather than thin plastic to ensure the drawers can withstand frequent opening and closing. Additionally, confirm the depth of the cabinet (typically 17cm to 24cm) to ensure it accommodates larger shoe sizes (e.g., US Men's size 12) without jamming.