Arc'teryx Men's Beta Sl Jacket 100% Nylon Imported Zipper closure Machine Wash 2" high 16" wide BETA SL JACKET - Designed to stay unnoticed until its needed, the super lightweight, compressible waterproof/breathable Beta SL Jacket weighs a scant 315 grams (11.1 oz). Made from N40r GORE-TEX fabric with Paclite product technology, it delivers proven complete weather protection with a high level of breathability. MOST PACKABLE - As weight and space are critical factors in the Beta SLs performance, the lightest and most packable GORE-TEX fabric, N40r GORE-TEX fabric with Paclite product technology, is used. WATERPROOF AND HIGHLY BREATHABLE - The fabric protects from the weather and offers a higher level of comfort during activity. As the Beta SL is intended for periodic emergency use, a less abrasion resistant textile is used to eliminate weight and bulk. However, the fabric has a mini ripstop construction that provides added tear strength without impacting weight. SIMPLICITY IN ACTION - The goal was to pare the Beta SL to its essence and achieve specific functional requirements for the lowest possible weight. Careful, efficient construction techniques allow Arcteryx to use micro seam allowances and tiny (13 mm) GORE seam tape. The Trim fit reduces fabric requirements and improves breathability. SUPERLIGHT - Carefully articulated patterning and gusseted underarms provide freedom of movement without adding bulk. The low profile Stormhood offers complete coverage with a streamlined design. This is a true minimalists hardshell, designed to be light, small and efficient.