The Cascadia Thermal Vest represents a milestone in lightweight thermal technology. Featuring a Thermal Shell polyfill, this is the lightest weight all-season thermal vest ever developed by Stormtech, suitable for both temperate and cold environments. Both outshell and side panels are constructed with spandex to allow optimal stretch - providing unmatched flexibility and ease of movement. Features: STORMTECH Thermal Shellâ„¢ Insulation; Durable Water Repellent Finish; High-Performance Stretch Woven Outer Shell; High-Density Brushed Back Knit Panels; Zippered On-Seam Hand Warmer Pockets; Single Hand Hem Adjustment; Partial Elasticized Armhole Trim; (Shell) 90% Recycled Nylon/ 10% Spandex Poplin, 2.06 oz/yd2 (USA) / 70gsm (CDN); (Shell-Secondary) 84% Recycled Polyester/ 16% Spandex 5.75 oz/yd2 (USA) / 195gsm (CDN); (Lining): 100% Recycled Polyester