Quality control should focus on the bonding strength between the platform sole and the upper, as this is a common failure point; look for vulcanized or cement construction with reinforced stitching. The platform height typically ranges from 3cm to 7cm; ensure the heel-to-toe drop (pitch) is ergonomically designed to prevent ankle strain. Compliance-wise, products must adhere to REACH (EU) or CPSIA (US) standards, specifically testing for phthalates, lead, and hexavalent chromium in the synthetic materials and dyes.