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 Cool Merino Long Sleeve is an ultra-lightweight Merino-blend base layer that excels at thermoregulation, breathability, and next-to-skin comfort, with natural odor resistance and fast drying. However, its silk-like blend yields limited durability and can be sheer in lighter colors, making it less suitable as a standalone top in cooler conditions and better used as a base layer under a layered kit for high-output activities.
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.
Patagonia’s classic base layer, heavier than Thermal Weight at 147-gram 100% polyester. It’s not as versatile as the Thermal Weight and can feel outdated for some, but remains a durable option for traditional layering.
