Asics Gel-Arctic 4 WR - The ASICS® GEL-Arctic™ 4 WR trail running shoe is designed to satisfy the needs of runners facing icy running conditions. This update features replaceable spikes with improved durability for optimal traction on slippery winter surfaces. Water-resistant synthetic upper offers breathability and support. Rearfoot GEL® Cushioning System is a medium sized silicone based gel that attenuates shock during impact. Forefoot GEL® Cushioning System attenuates shock during toe-off. Trusstic System® reduces the weight of the sole while decreasing torsion between the rearfoot and forefoot. SpEVA® midsole adds durability and shock attenuation. ASICS High Abrasion Rubber® (AHAR) is located in the heel and is a carbon rubber that offers exceptional durability. Wt. 13.1 oz. This product can be shipped to US addresses ONLY.