The best jacket to climb Kilimanjaro?

Outside Magazine's own gear girl suggests taking a look at the newly invigorated Eddie Bauer line with their First Ascent jacket. She also introduces Westcomb Cruiser, a company I'm not personally familiar with.

A good shell jacket is critical on Kilimanjaro. As I've pointed out before, temperatures fluctuate greatly on a daily basis. In the morning when you start off the sun is out and it's warm (about 70 degrees at lower camps). The clouds move in by noon and the temperature drops to freezing, especially on the Machama/Shira/Lemosho side of the mountain. By late afternoon the sun cuts through again for a nice warm finish before temperatures plummet for the night.

During the day you only have access to what you personally carry. The porters will take your other clothes, pack, tent, sleeping bag, etc. on to the next camp. So a good shell that can vent well while keeping you warm is a real god-send.

For more details on what to expect check out Kilimanjaro Adventures.