Fission Series: Insulated, windproof, waterproof outer layers. SL: Superlight. Uses the lightest weight materials available to provide high weather protection, performance andor packability, but with the right amount of durability. The lightest weight, fully waterproof, fully insulated jacket uses waterproofbreathable GORE TEXR and Arc'teryx exclusive ThermatekTM insulation. Features: Waterproof Insulated Lightweight Micro seam allowance 1.6 mm reduces bulk and weight Tiny GORER seam tape 13 mm Laminated ThermaTekTM non quilted construction eliminates cold spots One hand adjustable drawcords Articulated elbows Helmet compatible Storm HoodTM Insulated hood WaterTightTM external zippers Laminated pit zippers allow for faster venting Laminated die cut VelcroR cuff adjusters reduce bulk, and won't catch or tear off Laminated hem Adjustable hem drawcord Two hand pockets with laminated zippers Two internal mesh pockets Athletic Fit, Hip Length Weight: 610 g 1 lb 5.5 oz Activity: All Round Materials: N40p X GORE TEXR 2L ThermaTekTM 2.7 oz 100% nylon face, 92 gm . Comprised of a high tenacity 30 denier nylon fabric laminated to a 2.7 ounce continuous fibre fill insulation which is then completely immersed in DWR Durable Water Repellent treatment.