Barefoot Winter Boot Alaska GX1. Barefoot feeling for the chilliest of days: The Alaska is a lace-up boot made of soft suede leather with a special lining of pure virgin wool. That way youll enjoy pleasantly warm feet without compromise. The special lacing with thick leather laces underlines the rustic look. The new GROUNDIES GX1 barefoot sole is completely flat, thin and absolutely flexible letting you feel the ground with every step. Youll walk healthy and natural.