Polar Trex, Red Rock Vibram Icetrek ice-specific sole with snow gripping lug pattern provides superb winter traction Three-layer laminated soft-shell upper is DWR coated and is weather-resistant, wind-resistant and breathable Cam buckle ankle strap and cord loop closure system stays on in snow Internal grip cuff keeps the boot securely on dog's paw Fits dog paw width 3.25 Inch