Compression Clothing

I know there have been several posts in the past about compression gear.  However, I cannot locate them and can't figure out how to search for posts. I know a lot of folks like the Under Armour cold / heat gear.  What is the buying / sizing recommendation on these?

I found some at TJ Max (a discount outlet). They were only 10 bucks for real UnderArmour brand. I wear an XXL and to my ABSOLUTE surprize, found that the size small worked. It was tight tight tight but it held it all together when I excercized. Now that I've dropped 70 pounds, and am doing more vigorous excercise I find that the shirt is too short for me. The jogging makes it ride up my torso. It worked REALLY well for walking but now I'm going to get another one in a more appropriate size. Since buying it I've seen similar compression garments at WalMart.

Here is a link for some that I purchased. http://www.sportsmansguide.com/cb/cb.asp?a=331687 You get two pair in a package for twenty dollars. I was told by some one on here to buy one size smaller. I started with an XL and also bought size Large as well. What ever size you buy, remember they strech. When you first hold them you will think no way.  pan head

Cheapest site I found for the Under Armour was Goldman Brothers. I wear these everyday. http://www.goldmanbros.com/gc/customer/product.php?productid =17463&cat=100296