The Arc'teryx Rho LT Zip Neck is a warm, durable synthetic base layer with a cozy fleece interior that excels for cold-weather layering and a range of activities from camping to trail running and ski touring. It layers easily, includes handy pockets, and is built for longevity, though it is not the most breathable and has a boxy updated fit.
The Capilene Thermal Weight Zip-Neck (Women’s) is a warm, breathable midweight base layer with a long zip neck for venting and a slim fit that stays close to the skin for heat retention. It excels in warmth and breathability and dries quickly, but reviewers note odor retention and that the thumb loops are not high quality, with the layer not being a true thermal weight.
The Arc'teryx Rho Hoody for Women is a high-quality synthetic base layer designed for cold-weather performance. It features a balaclava-style hood and trim fit for efficient warmth, quick-drying comfort, and durable construction, making it versatile for layering in winter activities. It is pricey and breathability isn't ideal for high-output workouts, but it excels as a standalone cold-weather layer for snow sports and alpine pursuits.