Woolpower Socks Classic 400 For UK outdoor professionals, arborists and long-shift footwear users seeking premium sock comfort and insulation. The Classic 400 by Woolpower offers year-round wearability with a high merino-wool content and terry-knit structure throughout foot and shaft — perfect under boots or in work-wear contexts. Key Features & Benefits High-merino blend (~64% wool): Terry-knit foot & shaft: Medium–high length: Durable construction: Machine washable & robust: Technical Specifications Specification Detail Material Composition 64% Merino Wool, 35% Polyamide, 1% Elastane Fabric / Construction Ullfrotté Original 400 – terry-knit in foot & shaft Sizes Available (EU) 36-39 / 40-44 / 45-48 Colours Black Care Instructions Machine wash 60 °C; do not bleach; tumble low if needed Intended Use All-day wear under boots or as a high-insulation sock layer in outdoor/work environments Why Choose the Classic 400? If you’re working long shifts in boots, climbing, rigging or simply need dependable footwear comfort that performs in UK conditions, the Classic 400 socks deliver a premium blend of warmth, moisture-management and durability. Ideal as a foundational sock in your kit, they help keep your feet more comfortable so you can focus on the job.