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In sclerites the outer procuticle is hard exocuticle; the remainder is softer endocuticle.

absorption of digestion products by epidermal cells (recycling of cuticle components), the new cuticle is not yet differentiated, it is called procuticle (exo- and endocuticle)

The procuticle is chitinous and much thicker than the epicuticle and has two layers: an outer layer known as the exocuticle and an inner layer known as the endocuticle.

The exoskeleton consists of protein and chitin (a substance similar to cellulose) and has 2 layers: an outer epicuticle, often containing wax which reduces water loss, and an inner procuticle.