The Sparco flames and heat. A mix of kangaroo leather and synthetic leather to reduce weight and improve comfort Inner sock design eliminates the traditional tongue for a better fit and feel Thin rubber sole with a different pattern for optimal grip and feel on the pedals perforations provide greater airflow to reduce perspiration The X-Light+ competition boot is characterized by no tongue, instead an internal elastic sock is used, which provides a much more comfortable feel with a closer fit. An ultra-fast side lacing system provides a very close, secure fit and abrasion-resistant leather around the heel protects the foot and improves the life of the boot. X-Light+ racing boots can be screen printed in their entirety, in the colors and designs of your choice, through Sparco's Infinity project. Please call or email for details. Approved by FIA 8856-2018 and SFI3.3/10