Probably the most important thing to look for when buying a sweater is the material it’s made from.This is especially true given sweaters are usually made to help protect you from harsh conditions and cold climates. The material really does play a part in the level of warmth it will provide you. Wool is the best material available for providing warmth. The key to its ability to retain heat is based on its insulating level. Cashmere is another form of wool made from fiber extracted from Cashmere Goats.Sweaters can be defined by many characteristics, most notably the cut or style, the pattern, or the knit.