<b>Polartec Thermal Pro - This is considered the warmest of all of the fleeces and comes in a multitude of textures and patterns.</b> Its distinctive high-loft capability gives it the highest weight-to-warmth ratio.

Down is the best natural materials human havefound for keeping warm so far. It is made into down jackets after the procedures of washing, drying and grading etc. when referring to the thermal capacity, artificial material is there times lower than don. Then, what is down? Down is consisting of velvet (down) and feather. Down is the feather without the hard bars , the filaments of the feather branches cluster into each other, which forms into a stable thermal protection layer. Therefore, down is the main material of thermal maintain. Every ounce of down is about two hundred million filaments, the longer the filaments are the better the quality is, thus the velvet flowers are corresponding larger. While feather is the feather with small feather bars in the back and tail of a duck or goose, sometimes it is also made of broken feathers. In fact, because of the quality fluffing down, the number of feather mustn't be too large nor too small, it must remain a certain proportion.