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.
*Looking for the inseam length? Please refer to the product page to find out.
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
Designed with a mid-calf design for use with ski, mountain and other high-cuff boots, the Atom Legless are alpine-inspired baselayer bottoms built for movement. The Atom Legless features our 200gm RealFLEECE® fabric, which uses nylon core fibers wrapped in merino and then brushed, providing more warmth with less weight. The four-way stretch fabric and gusseted design allow for unrestricted range of motion, and flatlock seams prevent chafing whether you’re skinning up, skiing down or hoofing it through the snow.