The Atom LT Jacket is quite simply one of the best lightweight & versatile insulated jackets available; this year its been enhanced with a lighter, stretchy face fabric & enhanced collar design. This fantastic jacket can replace several layers of bulky fleece with one super light & warm layer. Filled with a highly efficient synthetic Coreloft insulation it provides enough warmth for active cold weather pursuits or can be used all year round when the temperature drops. The new face fabric is called Tinthan & is a 100% nylon 46g/m² 20D mechanical stretch nylon rip stop with an air permeable polyurethane coating & a durable DWR (Durable Water Repellant) finish. So the upgraded Atom LT Jacket is softer, more compressible, tough & just as practical...genius! The PU coating & DWR finish make this brilliant jacket highly weather resistant, keeping out all but the worst wind & rain. Polartec Hardface Powerstretch side panels provide fantastic freedom of movement & give an anatomical efficient fit whilst enhancing breathability under the arms. The Atom LT now features a re-designed collar with a soft brushed lining & added height to improve insulation. This is a big improvement over the old Atom LT Jacket as its collar was a bit minimal and too short. The Atom LT Jacket is insulated with 60g/m² Coreloft, an incredibly efficient synthetic insulation that performs even when wet & will dry out exceptionally quickly. We have found through practical experience that this jacket is highly water resistant, negating the need for a shell until it really is pouring down. Featuring the usual Arcteryx gorgeousness & finishing touches including the jersey knit stretch cuffs which are just so comfortable & unobtrusive. Tinthan nylon wind & water resistant hard wearing outer shell Breathable 60 gm 2 Coreloft insulation Polartec Powerstretch with Hardface technology side panels Soft brushed-lined re-designed collar Articulated elbows Gusseted underarms Two zipped handwarmer pockets One internal chest pocket Jersey knit stretch cuffs Drop back hem Adjustable hem drawcord