Completely waterproof, completely windproof, completely resistant to everything you can imagine !! It's the kind of product you need to think about before bying it because of the price... But you'll never regret !! I hightly recommend this product.
The perfect tool for all around and hard technical mountaineering ! Really light weight, great swing, "hand support" sliding on the shaft is perfect to deal with both ice climbing and walking on a sharp ridge. The equivalent of the more famous Petzl Quark, wich is a great tool too !
only 60 euros, many pockets, VERY DURABLE, warm, you're not afraid of loosing a goose quill as for ultra-light and compressible light down-jackets. The perfect down jacket for ice climbing, or a single day alpinism rout.