Determining the perfect ski size depends on a number of things. Factors such as height and weight provide an excellent starting point but there are other things to consider. Ski category, snow type, terrain and personal preference are just some of the things to take into account. The general rule is to pick a ski length that is somewhere between your chin and the top of your head. Advanced and expert skiers may chose skis that are slightly longer than head height. Besides, shorter skis make taking turns easier, but they are less stable at high speed.
You can find the value of water column in the description of the product. The water column indicates how waterproof the fabric is. The higher the value of the water column the more water pressure a jacket can withstand before it soaks through.
Breathable jackets will allow perspiration to escape, without becoming damp and cold. The higher the breathability the better moisture will be transported to the outside.