From the: Sonic US website
Fast Friends
Meanwhile, Sonic and Kintobor became good friends. Under Kintobor's tutelage, Sonic developed his natural running abilities to an extraordinary degree. Using Kintobor's experimental, supersonic treadmill, Sonic trained every day to increase his speed until he broke the sound barrier!
Kintobor invented special red sneakers for Sonic to protect his feet from the intense heat generated by the friction on his soles. As a matter of fact, the first time Sonic ran at the speed of sound, his quills and body became blue-hot from the supersonic shock waves and from then on, Sonic remained permanently blue.
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