Free Shipping on Orders Over $99

Free Shipping Policy

Free Shipping applies to all orders placed for $99 and above
(pre-tax value). Some restrictions apply:

  • Offer valid in the Lower 48 States only
  • Excludes Travel Cases and some other oversize items (prices can be calculated in the cart before checkout)

Castelli Cubi 18 Sock

The Cubi 18 sock from Castelli is mid-weight sock for thermal value but has a thinner, lower bulk design, with one exception. The sole of the sock from head to toe employs a Terry loop knit under foot for padding and extra warmth. The air space traps heat and also encourages moisture out, which is largely facilitated by a Merino wool blend knit, which adds the natural properties of the soft, comfortable wool fibers to the mix. Wool holds more heat and wicks naturally, getting moisture away from the skin.

Straight up sock construction you have come to expect from Castelli ensures that the Cubi 18 Sock is comfortable and durable. The toe and heel zones feature a tighter knit for greater wear, and sock maintains compression from the blended fabric and various directional alignment and construction. The Cubi moniker comes from the graphic design pattern on the cuff. An overlapping cube design in contrasting color adds a sporty look.


  • Mid-weight, but thin warm cycling sock, with bottom layer that adds loft, holds heat
  • Merino wool blend for warmth and durability
  • Terry loop knit under foot for padding and extra warmth
  • Wicks well to maintain heat, release moisture
  • Reinforced heel and toe with tighter knit
  • Lightly compressive stretch cuff with soft, finished top
  • Cube design pattern with contrast color integrated into base color
  • Cuff height: 18 cm (7.08")
  • Sizes: S/M, L/XL, XXL
  • Color: Black, Military Green, Pro Red
  • Weight: 54 grams (L/XL)
Close Window

Castelli Sizing Chart

Mens Shorts, Bibs, Knickers & Tights
Mens Jerseys, Jackets & Vests
Womens Shorts, Bibs, Knickers & Tights
Womens Jerseys, Jackets & Vests
Palm Circumference6-7"7-8"8-9"9-10"
Mens Socks
Womens Socks