Dynafit Speed Dryarn® Longsleeve in Black Out color is a men's thermal base layer designed for high-intensity mountain running and ski touring. Made with innovative Dryarn® fiber, it delivers outstanding moisture management, lightweight insulation, and lasting comfort during demanding mountain adventures.

• Dryarn® Technology: ultra-lightweight Dryarn® fiber wicks moisture away instantly and dries exceptionally fast, helping keep you dry during intense physical activity.
• Thermal Regulation: the excellent insulation-to-weight ratio retains body heat in cold mountain conditions without causing overheating during aerobic efforts.
• Natural Odor Resistance: Dryarn® naturally inhibits bacterial growth, helping prevent unpleasant odors during multi-day adventures.
• Ergonomic Fit: the close-fitting cut moves naturally with your body, minimizing friction beneath a shell jacket, backpack, or climbing harness.
• Flatlock Seams: smooth, low-profile seams eliminate chafing and ensure lasting comfort directly against the skin.
• Long Sleeves: full arm coverage provides additional warmth while offering protection from UV exposure in alpine environments.
• Versatile Layering: the slim profile fits comfortably beneath mid-layers or jackets and packs easily without adding unnecessary bulk.