The Brooks Range Invasion uses an innovative pole design and superlight fabric in order to provide a lot of covered space for only 3 lb. 7 oz. The tent pitches quickly from the outside and has a single wall of superlight 15 denier nylon to separate you from the elements. This is the lightest, weakest and least durable fabric used on any flysheet found in any winter tent we've tested. We like the Invasion because it is lightweight and spacious for its weight. However, when going light our testers prefer the Mountain Hardwear Direkt 2 because it is even lighter and is probably stronger and more durable, although considerably more cramped. We feel the Invasion sacrifices strength and durability in order to be slightly larger than many freestanding single wall climbing tents — a tradeoff that we don't believe is worthwhile. We would much rather be less comfortable in a tent that has greater weather protection.
Brooks Range has confirmed that the Invasion tent is not longer in production and has been discontinued. You might be interested in the Black Diamond Eldorado, which is widely available and can often be found on sale.
Also consider a floorless tent — our testers' favorite type of shelter for 99 percent of fast and light trips — found in our Ultralight Tent Review.