Up high, the air was freezing cold; but the dragon’s metal hide generated so much heat, it was like they were flying in a protective bubble. Talk about seat warmers! And the grooves in the dragon’s back were designed like high-tech saddles, so they weren’t uncomfortable at all. Leo showed them how to hook their feet in the chinks of the armor, like in stirrups, and use the leather safety harnesses cleverly concealed under the exterior plating.

The Lost Hero, Chapter XVI