Sweetspot 20 Thermal Sock

What Our Gearhead® Experts Are Saying:

"I reach for these on rides where the temperature doesn't fully commit to cold, since they never feel like overkill the way a heavier thermal sock can. The PrimaLoft yarn manages sweat well enough that my feet stay comfortable even as the ride warms up."

Castelli built this sock around PrimaLoft® yarn, chosen for its ability to deliver warmth alongside genuine moisture transfer rather than insulation at the cost of breathability. The mid-weight construction fits comfortably inside a standard cycling shoe without adding bulk that compromises fit or feel.

A 20cm cuff height extends coverage well up the ankle, striking a balance between the low profile of a shorter sock and the full protection of a taller winter cuff.

This is the sock built for the in-between days, when conditions call for more warmth than a summer sock but not the full commitment of a heavyweight winter option.