Even though the temperature of coal and pockets formed by them is same still we observe that pockets seem to be brighter than coal because they form the cavity and act as a black body so radiations emitted by them are highest intensity.

There are several types of pockets

Patch Pockets

Unlined

Self-Lined

Lined

Side Seam Pockets

Welt Pockets

Single Welt Pockets

Double - Welt Pockets

Welt Pockets with Flap

Side Front Slanted Pockets

In-Seam Pockets

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most of them have pockets

Lean Pockets are healthier than Hot Pockets and come in more varities. They are both produced by Nestle