La Sportiva Jackal GTX® is lightweight, reactive and shock-absorbing. It was created for ultra-running racing in the winter months and is studied, developed and tested in Val di Fiemme, Trentino, Dolomites. Inspired by those who run in search of the limit. Gore-Tex® Invisible Fit™ is the waterproof and breathable membrane laminated directly in the shoe. It is invisible and perfectly adheres to the foot for one natural fit comfort without pressure or contact points. Flexible, snug, waterproof - the fit and feel you love.