Kirkland Signature Merino Wool Socks
by Kirkland Signature
4 endorsements on r/BuyItForLife first recommended in Jan 2025
Costco's in-house merino wool sock, sold in multi-packs through Costco warehouses at a fraction of premium hiking-sock prices.
Added Jul 5, 2026, Updated Jul 7, 2026
Why it's buy-it-for-life
Frequently cited as a much cheaper substitute for pricier merino brands — some redditors wear them for years across hot and cold climates and in work boots. Opinions are split: others report they stretch out, slip down, or develop holes faster than premium socks, and a past redesign made them run smaller for some feet.
What redditors say
Recommended on reddit as recently as January 2025
Show 1 more mention
- 2r/BuyItForLife comment
kirkland changed up their merino wool soxs, and they are now too small for my feet. I sure do miss the old design.
replacement looks like Costco Merino Wool mediums at $3.75/pair
I still wear the Costco socks for casual wear, but they just don't compare to the performance of my DT's
Cant stand the costco socks. They stretch out after a while and tend to slip down. Get holes in em at a reasonable rate.
The Costco ones are my work socks. Fantastic in a work boot. Nicely cushioned, breathe well, warm and comfy. Zero complaints.
Big fan of the Costco socks.
All I ever wear is the Costco socks as well, wore them in NorCal in the 100's and Washington in the frost. They last me for years.