Uphill Sport 'Napa' Trekking Thermal Extra Warm Thick Merino Blend Socks - 8.5-11 UK

The UphillSport Napa Mountaineering Socks are designed for extreme cold weather conditions, inspired by the demanding climate beyond the Arctic Circle in Finnish Lapland. In these harsh northern environments, temperatures can shift rapidly from mild spring sunshine to freezing winds and deep snow, making reliable thermal protection essential. Built for mountaineering, winter trekking and snow sports, the Napa socks are engineered to keep your feet warm, dry and comfortable during long days outdoors.. Made with a high percentage of premium merino wool, these thermal mountaineering socks deliver exceptional insulation while remaining highly breathable. The thick merino construction traps warm air inside the fibres to protect against freezing temperatures, while also allowing moisture to escape efficiently. This helps prevent dampness, overheating and discomfort inside heavy boots during demanding outdoor activities. Merino wool is naturally odour resistant, quick drying and mulesing free, making these socks ideal for multi-day adventures and cold weather expeditions.. The Napa sock features a fully cushioned elastic terry structure throughout the foot, ankle and leg for maximum warmth, softness and comfort. The thick terry knit increases insulation inside hiking boots and winter footwear while helping absorb moisture during prolonged use. Even in severe winter conditions, the breathable merino wool blend works to maintain a dry and comfortable environment around the feet.. Designed specifically for performance and stability, the flexible calf-length shaft sits high above hiking boots and stays securely in place during movement. The combination of merino wool and Lycra provides excellent stretch and support without feeling restrictive. A fitted heel and seamless toe construction help prevent rubbing, bunching and pressure points, ensuring a close and comfortable fit throughout long hikes, mountaineering trips and snow sports sessions.. With a Thermal Grade 5 rating, the Napa sock provides maximum warmth for extremely cold environments. Whether you are mountaineering, winter hiking, skiing or exploring snowy landscapes, these socks are built to perform in freezing temperatures where comfort and protection are essential. The durable construction and premium natural fibres make them a dependable choice for serious outdoor enthusiasts who need high-performance thermal socks they can trust.