Light, packable and proven, the Atom LT – an Arc’teryx icon – is a performance warming layer for backcountry adventures, alpine ascents and downtown commutes. Refined for its next generation, we elevated its performance and extended its versatility. The Coreloft Compact 60 insulation retains heat when wet and withstands repeated packing and unpacking. The soft, durable Tyono 20 face fabric resists wind and weather, and stretch fleece side panels improve ventilation and freedom of movement. Moisture-resistant outer face fabric. Breathable. Insulated. Lightweight. Wind resistant. Performance stretch fleece side panels give ventilation. Trim fit for base layer or light mid-layer use. Internal chest pocket with zip. Two hand pockets with hidden zippers. 94% Polyester / 6% Elastane .Care Instructions: Machine wash in cold water on a gentle cycle, do not bleach, tumble dry on low heat on a delicate setting, do not iron, do not wring and do not dry clean.