The Spantik is a much more comfortable alternative to technical plastic mountaineering boots & is just as capable. La Sportiva have created a very warm yet technically capable boot by using a double soft boot construction that has the comfort of summer boots with the full technical climbing attributes of stiff & heavier plastic boots. This ingenious construction reduces weight & really speeds up drying time which is crucial if you are on a multi day route. The outer boot, whilst being hugely supportive & protective also allows flexibility for long walk-ins & has a unique overlap opening that makes getting the inner boot in place much easier. The outer is made from a fusion of synthetic materials that do not absorb water, dry quickly & features a moulded TPU ankle spoiler that enhances the support & stability required for technical routes or even skiing. The boffins at La Sportiva have designed a quick & easy way to lace the boots, a single lace is locked into place using an ingenious mechanism that eliminates knots & can be easily secured whilst wearing heavy gloves or mitts. The inner boot itself is a work of art, they are very different to the usual shapeless foam efforts often found in hard shell boots with well placed padding & supportive fabric overlays around the instep & ankle. Like the outer boots they use a speed lacing system secured by a Velcro tab. This system is quick & easy to use & holds the lace tension securely. The inner can also be heated to achieve a true custom fit, just follow the instructions carefully! Whilst the inner & outer boots provide excellent insulation the majority of the cold is felt through the sole, as thats the bit thats in contact with the ground. Traditionally boots overcame this problem by making the soles dense reducing climbing sensitivity & increasing weight. The Spantik however uses a unique 5mm thermal structure carbon fibre midsole to provide strength & support without sacrificing feel & sensitivity. Shock absorbency & further insulation is provided by a micropore EVA midsole with TPU inserts to provide the support for crampon bindings. The outer sole is the aggressive Vibram Montagna which has a rolling rocker for easier walking, deep lugs for loose ground & a dedicated climbing zone for...climbing! Overall the Spantik is the perfect expedition, winter Alpine & technical climbing boot that will protect you from extreme cold in the most inhospitable places on Earth.