Experience the bliss of warm feet during winter sports with the Hotronic Usa XLP C Anatomic Insole. As a semi-custom solution, this BOOTDOC Anatomic insole comes with a pre-installed Heating Element, providing an easy integration into a wide variety of footwear while offering additional support. Whether you're gliding down snowy slopes or trekking through frosty trails, maintaining foot comfort has never been easier. Please note, this insole is designed for use with the separately sold Hotronic XLP C power set. Available sizes range from Small to Large, catering for Men's US 4 to 10 and Women's US 5 to 11. Slip into warmth with Hotronic.