When evaluating soft luggage wheels, prioritize material composition, specifically High-Elasticity TPE (Thermoplastic Elastomer) or Polyurethane (PU), as these provide superior shock absorption and noise reduction compared to standard PVC. Ensure the bearing type is a precision steel ball bearing (608RS or similar) to guarantee smooth 360-degree rotation. Additionally, verify the load-bearing capacity; for standard checked luggage, each wheel should support at least 15-20kg to ensure a total safety margin for the suitcase.