ECCO. 831814-01543. TRACK 25 M PRIMALOFT SHOE. TARMAC. Uppers on this outdoor boot consist of durable oiled nubuck yak leather. GORE-TEX waterproof construction ensures dry and comfortable feet in wet weather conditions. Warm-lined with revolutionary Primaloft 200g microfibre insulation -- keeping feet warm dry and comfortable. Removable leather-covered inlay sole with ECFS for increased air circulation and optional extra width. FLUIDFORM DIP P.U foam midsole combined with a T.PU outsole.