The Trace sole provides supreme grip, dampening & stability for a rider's foot; A cut-out in the cuff hinders the boot from bulging out, even after many days on snow; EVA Liner - The liner wraps around the foot like a second skin, without creating any pressure points; The 3D FPG Insole features a cupped heel and ergonomic arch for maximum support for the whole foot; Flex Index 5 - forgiving & comfortable flex for adults; Forward Lean 7deg - For rookies and easy riders