Use the chart below to determine your size. If you’re between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. If your measurements for chest and waist correspond to two different sizes, order the size indicated by your chest measurement for tops and your hip measurement for pants.
Our three different fits - slim, regular, and relaxed - ensure that when worn together, layers move and breathe like a single garment.
A snug, close-to-body fit for low bulk layering.
Neither snug nor loose - garments that are worn solo or over other layers.
Loose fitting lightweight layers.
free returns & exchanges
A midweight full-zip top with a technical design and a warm yet light construction, the Atom Long Sleeve Zip is ideal for chilly pursuits, whether you’re high in the mountains or down on the flats. The Atom Long Sleeve Zip features our 200gm RealFLEECE® fabric, which uses nylon core fibers wrapped in merino and then brushed, providing more warmth with less weight. Zippered hand pockets and a welded zippered chest pocket store small essential items. The thumbhole cuffs make for easy layering and add a touch of warmth to your hands on chilly runs.