When the bite of the winter air nips at your skin through the thin fabric of your clothing, and the shivers travel up and down your spine - that is when you know you are in need of polypropylene thermal underwear! But just how do you go about buying them? There are several factors to take into consideration when selecting which garment is best for you.

The very first condition to consider is your weather! Determine just how cold the nip of winter is wherever you live and then you can will have an idea about how thick you need the garment to be. You certainly don't want to end up buying too thin or thik of an item because it will result in you either being too cold or too warm - neither of which is comfortable. In determing this, don't neglect to consider your activity level. Naturally, the more active you are, the thinner the clothing you wear will have to be - and vice versa.

Polypropylene can have a tendency to retain odours, and the last thing you want is for your underwear to be offensive! It is best to ask the supplier or assistant about the odor retension of the fabric just to make sure that you don't end up with a stinky situation.

A very simple, yet overlooked, condition to consider is how manageable the item is in terms of care. Try to find a machine washable, machine dryable thermal undergarment - because nobody wants to be hand-washing underwear in cold water and then waiting for it to dry on a sunshine-lacking washing-line!

Polypropylene thermal also has to be woven together in the correct manner. Ask if the item is wicked, which means it has been woven together with a built-in capillary action to manage perspiration - this is important for insulation purposes and to keep your body dry.

It is a good idea to choose blended polypropylene thermal underwear - wool and polypropylene are best as it is economonical and wicked. As with any buy, there are disadvantages and having wool making up part of the garment will result in the garment taking longer to dry.

As for the pricing of the underwear, it is an important factor - but it also depends on who the item is for. If you are buying the garment for kids, then it is a good idea to try and buy the cheapest item that will still serve it's purpose. Kids grow out of their clothes too quickly for you to bother with durability. As for adults, you will want something that will last so that you don't need to spill out cash every winter on a new set.

The very last tip, though not in the least the least important, is to try the underwear on. Sounds simple, but often people don't take the time to do it. Nobody wants to be uncomfortable in ill-fitting underwear - especially not in bad weather. So don't take this step for granted!

There you have the ultimate guide to buying polypropylene thermal underwear. Don't forget that your kids might be needing boys thermal underwear too! Happy shopping!