Designed to power through uphills and descents, the X ULTRA is now available in an all-winter version. Just as agile as a trail-running shoe, it offers all the stability, grip and protective comfort you need to tackle wintery terrain and cold temperatures. Not to mention cozy 3M Thinsulate(TM) insulation. Winter ready We&';ve added a grippy Winter ContagripA(R) outsole that thrives in the ice and cold, as well as a gaiter hook if you need more protection. Winter comfort Keep warm and dry with 3M Thinsulate(TM) 200g insulation, a CS waterproof membrane and cozy liner. All-terrain stability The ADV-C Chassis targets articulations on the outer foot to optimize stability without limiting your mobility.