Arcteryx Accelero Jacket - Men's 100% Spandex Highly breathable - maintains comfort during aerobic activity Mechanical stretch textile for unrestricted mobility - fabric is inherently stretchy without the use of Spandex fibres, making it more durable DWR finish (Durable Water Repellent) helps bead water from fabric surface Polyester double-weave fabric, with bamboo-charcoal fabric-backer next to skin layer, helps to control odour build-up Strategically placed seams increase comfort and reduce chafing