Sierra Designs has been cranking these out for years. In fact it's probably some of the earlier lightweight gear made for the US market (don't quote me on that). It's a simple PU coated nylon shell. They are light and cheap, but they are sweaty. Water resistance is good, but the seams aren't taped or otherwise sealed, so it's a kind of "what's the point" design. I keep one in my auto emergency kit-- bought in a thrift store for $3.
There are a lot of athletic-style warm-up/windbreakers that you can find in discount stores like Ross or Marshalls, or Burlington Coat Factory that are about the same weight and price, but more breathable. If you want it all-- weight and performance, Montane is it. There are a bunch on Ebay right now-- that's where I got a Lightspeed. Do go up one size for US sizing.
Helly Hansen, Patagonia, and Outdoor Research all make some version of an UL windshirt, but none are as versatile as the Montane and most are higher priced too. No free lunch!