This article examines interlayer performance for tropical large-span retail façades and skylights, taking the Haikou International Duty-Free Complex as a performance brief. In a hot, humid, monsoon climate, the laminate must stay bonded and clear, block a high share of ultraviolet light, and remain compatible with coated insulating glass. The piece also discusses long-span domes and triple-glazed laminated skylights, where the interlayer has to stay optically clean for the life of the roof.