Today it will be about base layer. When it comes to base layer you have to chose what you will use it for. It can be categorized into three levels. Light-mid. heavy.  The lightweight is good when you have high intensive activity and its not so cold. It will dry fast, but as said before will be colder. The range will be between 125-200 g/m(2) This base layer i also the most breathable, perfect for the mountain run/sky run for example.

The midweight will be typically around 200-300 g/m(2).  this will be of course the one that you can use in broad range, it will be some breathable and can be warn in mid cold conditions. The disadvantage is that it can be hot and feel muggy in mild weather conditions. The heavyweight will normally be around or over 300 g/m(2) is primarily developed for demanding conditions in really cold weather. Using this variant in mild weather it will be really sweaty. You can chose by two different material: merino-wool or synthetic. Merino,  Breathable, comfortable, warm for the weight, wicks moisture well, fights odors naturally, retains heat when wet, and UV-resistant. but the negative will be Pricey, not very durable, longer dry time, and typically requires line-drying. Synthetic, Durable, comfortable, lightweight, wicks moisture well, generally affordable, easy to care for, and dries quickly. Negative, Not as odor-resistant, warm, or breathable as merino. So if you are going to very high intensive activities, then the synthetic can be the first choice. I like the ones with crew neck and breast zipper so I can ventilate when needed.

And if you are going for real cool weather, the Brynje and Amundsen of Norway will be my first choice.

See ya tomorrow.