The Hymir Smock from Jottnar has to be one of the most breathable, robust, fully waterproof smocks on the market. Made from the lightest weight Polartec Neoshell available (96g/m²) & only weighing, a stupidly light, 330g. You can pack your Hymir away into its storage sack, pop it into your bag & only bring it out when you need it. Most of the time you will probably forget you are carrying it. This is the lightest weight Noeshell smock on the market. The minimalistic design means there is no unwanted bulk, & the fact that there are no hand warming pockets makes it perfect for use with a climbing harness or backpack hipbelt. The stuff sack that is provided comes with a crab loop so you can attach it to your harness if you need to get it out quickly at a belay point. The spacious helmet compatible hood features a mouldable wire stiffened peak & internal drawcords to keep thing looking tidy. Polartec Neoshell is 100% waterproof with a 10, 000mm hydrostatic head. Its super breathable with a 0.5 ft²/min/ft² air permeability rate. You will be hard pushed to find a more durable jacket at this weight with Jottnars quality of construction. This Jacket is the lightest weight Noeshell smock on the market. Waterproof, breathable, 3 layer Polartec Neoshell Lightweight, packable, robust Athletic, streamlined, articulated cut Adjustable, helmet compatible hood Scooped drop back hem YKK Aquaguard water repellant half zip for reduced weight Harness compatible chest pocket with YKK Aquaguard water repellant zipper Zippered stuff sack with carabiner loop Wire stiffened hood brim with fully mouldable peak Internally protected hood pull cords Corded, glove compatible zipper pulls One-handed, elastic hem drawcord operation BEMIS® ST-318 13mm seam tape for light weight