Arc'teryx LEAF Cold WX Bottom SV

The Arc'teryx LEAF Cold WX Bottom SV weighs 295 grams and uses Polartec Power Stretch fleece for heavyweight thermal performance in extreme cold. I wear this during single-digit snowboarding days when lighter base layers fail. The gusseted crotch enhances durability while allowing unrestricted movement, and flatlock seams prevent irritation during extended wear. Designed for tactical operations in freezing environments, this provides thermal efficiency through moisture-wicking fabric. The integrated fly envelope allows easy access, and the next-to-skin fit maximizes heat retention.

How Does the Cold WX Bottom SV Compare to the Rho LT Bottom?

The Cold WX Bottom SV sits at 295 grams compared to the Rho LT Bottom which uses lighter Torrent stretch fleece. The Cold WX targets extreme cold with heavyweight Polartec Power Stretch, while the Rho LT prioritizes breathability for high-output activities. The Cold WX provides substantially more insulation, making it better for stationary cold exposure where maximum warmth matters.

The fit differs significantly. The Rho LT features a trim fit for easy layering, while the Cold WX uses next-to-skin fit for maximum heat retention. The Cold WX feels indestructible compared to the Rho LT's lighter construction.

Does the Cold WX Bottom SV Work for Snowboarding?

Yes, exceptionally well for resort riding in extreme cold. I wear this when temperatures drop below 20°F, paired with insulated pants. The heavyweight construction provides warmth that lighter base layers cannot match, eliminating the cold-leg feeling during chairlift rides. The gusseted crotch allows unrestricted movement during aggressive turns without binding.

The flatlock seams prevent chafing during repetitive movements. After full days of riding, I experience no irritation despite constant motion. Moisture-wicking properties pull sweat away during high-output runs, then retain warmth during lift rides.

How Does It Compare to Other LEAF Cold Weather Gear?

The Cold WX Bottom SV pairs naturally with the Rho AR Zip Neck for complete cold-weather layering systems. Both use Polartec Power Stretch fabric with similar thermal properties, creating a cohesive base layer that manages moisture while retaining heat. The zip neck provides ventilation control through its front zipper, while the bottoms maintain consistent warmth.

Against the LEAF Cold WX Neck Gaiter at 55 grams with 95% merino wool, the combination addresses different exposure zones. The neck gaiter seals jacket collars against wind and snow infiltration, while the bottoms provide lower-body thermal protection. For face protection in tactical scenarios, the LEAF Assault Balaclava FR at 50 grams offers flame-resistant mesh construction, though its tactical design lacks the cold-weather insulation these bottoms provide.

How Do I Care for the Cold WX Bottom SV?

Machine wash on gentle low cycle with like colors, avoiding bleach and fabric softeners that damage Polartec fabric. Tumble dry on permanent press low setting rather than air drying, which takes significantly longer with heavyweight fleece. Do not leave wet or wring out, as this stresses the fabric structure. The fabric releases plastic microfibers during washing, so proper laundering minimizes environmental impact.

The heavyweight construction handles repeated washing better than lighter base layers, maintaining thermal properties through dozens of cycles. The flatlock seams stay intact without unraveling, and the gusseted crotch retains its shape. Dark colors should be washed separately to prevent color transfer.

When Should I Choose the Cold WX Bottom SV?

I grab this for snowboarding below 20°F, winter camping in extreme cold, high-altitude hiking in freezing conditions, and any situation requiring maximum warmth without bulk. The temperature range below 20°F works perfectly for extreme cold exposure. Above 30°F, lighter options provide adequate warmth without the overheating that heavyweight fleece causes during active pursuits.

The next-to-skin fit requires accurate sizing in XS, S, M, L, XL, and XXL options. The fabric and dyeing processes are conducted in the United States, ensuring quality control and consistency. The heavyweight construction makes these less packable than lightweight alternatives, but the durability justifies the space when extreme cold is expected.

The thermal regulation balances heat retention with moisture management, preventing the sweat-then-freeze cycle that occurs with non-wicking insulation. The unrestricted mobility from gusseted construction and stretch fabric allows full range of motion during physical activities without the restriction that traditional heavyweight base layers impose.

Find current availability at Arc'teryx or authorized LEAF dealers.