Crafted to deliver optimized performance for minimal weight, the Alpha SL Pant easily fits in a pack, ready to provide waterproof/breathable protection if needed. N40r GORE-TEX fabric with Paclite product technology is waterproof, breathable and exceptionally light. Its nylon ripstop face offers some abrasion and tear resistance. Where higher levels of durability are required, Arc'teryx uses hardwearing N150p-X GORE-TEX fabric. The Alpha SL has an intelligently designed side zip system. Running the length of the pant, the zipper separates completely, making the pant exceptionally easy to put on and take off as weather shifts. By partially unzipping each side at the top, the system creates a drop seat, a key feature that is truly appreciated when needed. Arc'teryx WaterTight zippers are used for a streamlined, snag free profile. The Alpha SL Pant balances essential features with minimal weight. Drawcords at the hem work with a tuck away bootlace hook to provide a secure, full coverage fit, even while climbing. The dual waist adjusters fit comfortably under a pack or harness, and the trim leg fit reduces crampon snags and allows for more effective layering. Fit and ergonomic performance are essential, so Arc'teryx uses a women's specific design, carefully articulated e3D patterning and a gusset at the crotch for maximum freedom of movement. Ergonomic 3-Dimensional (e3D) patterning brings an additional level of articulation to provide enhanced range-of-motion in our Trim, Athletic, and Expedition fit categories. The application of e3D patterning allows for enhanced mobility for sport-specific activities in challenging environments. Standing in as the "Arc'teryx Standard" fit, the complex patterns used utilize anatomical shaping and gussets to enhance motion and eliminate excess bulk. Trimmer than the Relaxed fit with room for a base layer, a light fleece mid-layer and a synthetic or down filled mid-layer.