No-one does waterproof shells better than Arc'teryx, a team of mountain fanatics from Vancouver who have developed some of the industry's leading designs. The Alpha SL is stripped back to allow for a very small pack size and minimal weight of just 342g making it ideal for lightweight trekking. Features are all impeccably designed with fine detailing. The hood is highly adjustable, there are two big hand pockets, laminated underarm zips, low-bulk cuff adjusters and a drop back hem for greater coverage. All zips are WaterTight and the package is ready for full on storms whenever called upon.