The Trek Ascent Insulated Vibram Fivefingers are great option in colder weather.
They share the same sole design as the popular outdoor Trek and Trail Vibram Fivefingers V-Trek. With a 4mm insole for allay comfort on unpredictable terrain and a 4mm outsole with a more aggressive grip design. Also added into the sole compound on the Trek Ascent Insulated is ICE TREK which offers greater grip across a range of lower temperatures.
The biggest difference the Trek Ascent Insulated offers is its thicker wool blend insulated upper for greater warmth in colder conditions. This thicker upper usually require the wearer to go up an EU size from their usual Vibram Fivefingers EU size.
The Insulated later is covers in a nylon shell material which offers some water resistance. Here at Barefoot Junkie we give ours a regular spray down of fabric waterproofer to enhance this water resistance.
The Trek Ascent Insulated offers a warmer option in the minimalist Vibram Fivefingers barefoot shoe range whilst not compromising flex and feel.