DetailsStyle #2128941Expand or collapse section A single layer can have a bigger impact than you think. Our go-to, packable long sleeve houses the highest warmth-to-weight ratio of any fabric in our line, along with high breathability, conveniently comfy thumb loops, and a secure zip pocket for stashing essentials. This unique active mesh construction consists of hollow, tube-like fibers that absorb sweat quickly and efficientlysupporting insulation and heat-shielding properties to keep you temperature-regulated from the trail to the lift, and everywhere in between. Uses: Backpacking, Camping, Endurance Sports, Expeditions, Hiking, Mountain Running, Skiing/Snowboarding, Superlight Backcountry, Ultralight Backpacking, Winter Camping Brushed back mesh made with a hollow core yarn that provides breathability to keep you cool and comfortable Anti-odor finish High warmth-to-weight ratio Secure zip pocket front left Easy to layer under outerwear or wear on it\’s own Thumbholes made with a soft knit fabric construction MHW heat transfer logo at left chest Reversible to allow for two levels of warmth when worn reversed with backer faced out creates more airflow and keeps you 28% cooler Imported MeasurementsExpand or collapse section Center Back Length: 28 in / 71.1 cm Approx. Fabric Weight*: 115 g/m / 3.39 oz/yd Approx. Weight*: 5.5 oz / 157 g *Weight based on size Medium. Actual weight may vary.