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Assos Ultraz Winter Socks

Every cyclist who rides into and during the winter longs for the perfect blend of warmth, low bulk, coverage and breathability of the ideal pair of winter cycling socks. Assos has two levels of winter gear. The standard Winter options dominate the cold weather down to and slightly below freezing. The Ultraz Winter options push that range down further, and add more protection. That said, the Ultraz Winter pieces encourage high output training by ensuring that breathability and comfort are not only considered, but given prominence in the design process.

Riding through the harshest winter conditions takes a toll on our extremities, which is why proper layering -socks included - always becomes the make-or-break point. The Ultraz Winter Socks have been engineered specifically for these situations, constructed using a winter-ready blend of polyester and wool. This heavy-hitting blend creates a robust knit that effectively insulates the toes, foot, and ankle, while simultaneously transferring moisture through the yarns to the outer surface, ensuring your feet stay dry and comfortable inside your shoes. As with the regular weight Winter Socks, the designers targeted the arch with a ribbed band for further support and boosted breathability. A contrasting reflective band vertically aligned with the Achilles for added visibility in low-light conditions. The blue "ultra" winter climaCode is now a prominent visual cue for layering and also assists in wardrobe organization.


  • Supportive medium-weight tall sock for the coldest, challenging winter conditions
  • Heavy-hitting material blend creates a robust knit with excellent insulation with premium moisture transfer and breathability
  • Excellent comfort with points of irritation, low bulk for a medium weight sock, making fit in all but the closest fitting shoes feasible
  • Spot The Light light-absorbing polyester yarns have been developed with photoluminescent pigment in order to remain luminous in the absence of light
  • 360°Ribbed Arch band keeps the foot comfortably supported within the shoe
  • Seamless Construction provides a seamless wrap on foot; for friction-free comfort
  • Right / Left specific, anatomically aligned construction
  • Composition: 50% polyester, 26% polyamide, 21% wool, 3% elastane
  • Sizes: I, II
  • Color: Blackseries
  • Weight: 54 grams (size II)
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Assos Sizing Chart

Mens Shorts, Bibs, Knickers & Tights
Mens Jerseys, Jackets & Vests
Baselayers - Unisex
Womens Shorts, Bibs, Knickers & Tights
Womens Jerseys, Jackets & Vests
Socks / Shoe Covers
FootEuro 35-38Euro 38-42Euro 43-46  
Arm/Knee & Leg Warmers