Description of Arcteryx Sigma LT Jacket - Women's The dual fabric fusion of the Arcteryx Sigma LT Jacket blocks the wind without overheating the core. WINDSTOPPER® fabric protects the front, while new Bonded Poly underarm panels channel excess heat away from the body. The Sigma LT features no-lift gusseted underarms and laminated construction for enhanced protection and freedom of movement. A Windstopper front warms in winter and a Bonded Poly back lets off enough steam to prevent in-the-track overheating. During heart-pumping aerobic activities, the Sigma LT moderates rising internal and falling external temperatures. Features: DWR finish Full front zip with interior wind flap Laminated die cut Velcro® brand fasteners cuffs Laminated hem drawcord No-lift gusseted underarms One internal chest pocket with laminated zip Soft brushed lined collar Trim collar Two had pockets with laminated zip Waist length Materials: Bonded Poly Eiger Lite Stretch WINDSTOPPER® ARC'TERYX Technology WINDSTOPPER® Stitch Count Lamination Technology Soft Brushed Lined Collar