Which layer of the insect cuticle contains the waxy layer that minimizes water loss?

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Water balance in insects hinges on the outer part of the cuticle. The epicuticle is the outermost layer secreted by epidermal cells and contains lipids and waxes that form a waterproof film. This waxy layer acts as a powerful barrier to water vapor, greatly reducing trans-cuticular water loss and helping insects stay hydrated in dry conditions. The inner layers, the procuticle which includes the exocuticle and endocuticle, are mainly structural, providing strength rather than preventing desiccation.