Cross country skiing is assosiated with winter and minus degrees. This may not be the time of year that you think it is necessary with the waterproof and breathable GORE-TEX® membrane? But ski boots with GORE-TEX® offers a whole new ski experience with greater comfort warmer feet.
Snow is frozen water, and a skier produce heat. The feet are warm and this heats up the boots that often are covered in some snown when skiing. When this snow melts, it will penetrate the material and enter the shoe.
The sun can also warm quite well in the winter. If the snow starts to melt, the shoes quickly get wet as well. And wet ski boots gets quickly cold. When the temperature is low, the moisture on a wet foot and sweat that freezes when it gets into the colder outer material of the shoe will have a strong cooling effect.
To prevent water from penetrating the shoe, it is common to have a waterproof outer material on ski boots. This material is completely sealed so it keeps the melted snow out of the shoe. But this material is not breathable, so the sweat in the shoe will stay in the shoe. A person in activity sweats approximately 2dl on each foot during a day. After wearing ski boots for a couple of hours there will be a considerable amount of moisture inside this tight "shell". This will make your foot sweaty and clammy which in turn will cool down the foot.
You can easily see if the shoes draw water if you measure the weight of the ski boots before going skiing and just after you have come back in. In most snow conditions a ski boot, due to the melting of snow and sweat, will be heavier when you get back. This extra weight is moisture that has reduced the insulation and cooled down the foot.
On a ski trip, the foot will be cooled down over time, and it may not be until you come back inside you notice how cold you've been on your feet. If you see sock marks on the floor after taking off the ski boots, you have had wet feet.
GORE-TEX® in ski boots
When GORE-TEX® membrane is used in a ski booth the booth will be both breathable and waterproof at the same time. The GORE-TEX® membrane have microscopic pores, 20,000 times smaller than a water droplet, which means water droplets can’t pass through. The pores are 700 times larger than a water vapour molecule which means perspiration passes right through. This is what makes the membrane breathable. Read more about GORE-TEX® here.
A ski booth with GORE-TEX® will give a new skiing experience. The GORE-TEX®-membrane will let sweath and vapor out, but will not let the water droplet's in. This way the GORE-TEX® ensure dry and comfortable feet the whole session and the feet will stay warm.
In Alfa's ski boots for training and competition we have developed a perforated outer material AlfaAir™ which together with the GORE-TEX® membrane provides a truly unique ski experience. AlfaAir™ consists of two laminated layers, the outer part is extremely durable and maintenance-free. The perforation provides increased breathability, and combined with GORE-TEX®, this gives a whole new experience of function and comfort.
AlfaAir ™ is a maintenance-free material that makes it easy to take care of the ski boots if you also use them for roller skiing. Read more about how to take care of AlfaAir™ shoes here.
Alfa ski boots with GORE-TEX®
Alfa ski boots are the one competition ski boots with GORE-TEX®. The shoes are warm, waterproof and breathable. This makes them just as good in sunny days as in sleet and rain. The ski boots comes with Rottefella soles and YKK-zipper which is the best zipper in the world, durable and with low weight. This makes the ski boots perfect for training and competitions cold winter days, slushy wet snow in the sun and rollerski trips in sun ornat at least rain.
The competition model Trac A/P/S GTX is a warm and light weight classic model for the active and demanding nordic skier. For classic marathon races will Trac A/P/S GTX be the perfect choice.
The Norwegian Magazine SKIsport tested the boot and said: "There are hardly any racing shoes that will keep you warmer and drier, while maintaining competitive qualities."
For children and youths Trac JR GTX is a warm and comfortable shoe build on the same principles as the adult shoes and developed for both fun and serious skiing.
Alfa ski boots for backcountry skiing and expeditions
Alfa is also one of the leading brands for backcountry skiing and expeditions boots