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Arc'teryx Bottoms Size Chart Arc'teryx Tops Size Chart Which exceptional breathability, the Proton LT Hoodie is a crucial piece for midlayer wear during highly aerobic mountain hikes, backcountry expeditions, and ice and rock climbing. Trim Fit is a motion-friendly cut with reduced fabric for minimal bulk. LT: Light Weight blends highly effective tech with lightweight, minimalist cut. Fortius™ Air 40 softshell:• Abrasion-resistant softshell maintains high breathability.• Stretch weave for full range of motion.• DWR (durable water repellent) finish improves the water-resistant weave.• 71 g/m² fabric weight. Coreloft™ Continuous 65 insulation:• Continuous filament construction helps to eliminate cold spots and bunching caused by gaps in insulation bunching.• High degree of hydrophobic performance speeds the passage of moisture vapor from perspiration.• Synthetic insulation improves thermal retention while maintaining low bulk.• 2.0 oz/yd² / 65 g/m² fabric weight. Attached, helmet-compatible and adjustable hood with elastic brim. Full-length zip with inner draft flap. No Slip Zip™ works like a series of speed bumps to prevent the front zip from self-opening. Long sleeves. Elastic paneled cuff for a snug, stretch fit. Zip chest pocket. Zip handwarmer pockets. Droptail hem with adjustable drawcord. Shell: 92% nylon, 8% elastane;Insulation: 90% polyester, 10% acrylic;Lining: 100% nylon. Machine wash and tumble dry. Imported. Measurements: Length: 25 in Product measurements were taken using size XS. Please note that measurements may vary by size.