Salomon Women's Speedcross 3 Trail Running Shoe 100% Synthetic/Fabric Rubber sole Heel measures approximately 1.75" 3D Advanced Chassis - Controls shoes twisting motion. Flexes under the heel to absorb shock and provide stability. Sensifit - Actively cradles the foot to ensure a secure and precise fit for maximum stability and a secure fit. Quicklace - Minimal and strong one hand, one-pull tightening lace that secures shoes quickly and provides good stability and support. For a more customised fit. Contagrip - Outsole blends several different hardness combinations of Contagrip rubber for the perfect mix of grip and durability across varied terrain. Ortholite Sockliner - Ortholite foam and EVA heel cup creates a cooler, drier, healthier foot.