The highest insulation for the most extreme winter conditions the latest Ultraz Winter Sock provides additional warmth with a higher cuff for more coverage. High insulation. High breathability. Both are critical for comfort in the coldest winter conditions because they preserve warmth and eliminate the risk of internal moisture turning into a clammy chill turning into frigid stinging ride-ending discomfort. The Ultraz P1 achieves both with triple-layer insulation in key areas that breathes well. The yarns are also infused with merino wool which has natural odor-resistance and – in the event precipitation or road spray gets past your winter booties – stays warm even when wet. The cuff height up to 18cm 7in reduces the risk of gaps between layers. Composition 45%Polyester 32%Polyamide 20%Wool 3%Elastane The finer details FEATURED FABRICSA blend of synthetic fibers and wool that maintains the best qualities of both for a breathable textile with stretch-and-return properties odor resistance warmth while wet and extreme insulation. CONSTRUCTION/FIT160-needle construction eliminates seams and wraps in lightly compressive support preventing slumping or restrictive pinching. Triple layers on the toe and midfoot boost insulation on the most exposed areas.