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Its design allows air to circulate freely around the cookies so they bake and brown evenly. A jelly-roll pan (either 15 Â½ by 10 Â½ inches or 18 by 12 a.k.a. a half-sheet pan) has 1-inch-high sides and is perfect for making cake rolls; it can stand in for a cookie sheet in a pinch. It's also a terrific roasting pan for veggies and more.
Then, once the cake is completely cool, the baker can flip it over, fill it and place the roll on a plate seam side down before slicing and serving. A jelly roll pan is usually made of aluminized steel as this material resists rusting and allows for an even distribution of heat, and non-stick versions are available.