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"These socks truly match or top the performance and feel of the best socks out there without using materials with pthalates, BPA or other harmful materials."
The Ultra-Thin Striped Crew Sock is a lightweight crew that slides into any shoe, exceptionally comfortable with cushioned support and a playful stripe.
Why you'll love it:
51% Sustainable Nylon, 23% BCI Cotton, 23% Sustainable Recycled Polyester, 3% Spandex
Care
Machine wash cold on normal cycle. Tumble dry low.
Built on CiCLO® biodegradable fiber.
CiCLO® is built into our recycled synthetics to do two things: shed fewer microplastics in wear and wash, and biodegrade rather than linger. Independent testing shows CiCLO treated fibers biodegrade in under four years — so they don’t add to long-term microplastic pollution.
Certified by ECO PASSPORT by OEKO-TEX®.
| Sizing | Men | Women |
|---|---|---|
| Small | US 5 – 7 | US 5 – 7.5 |
| Medium | US 7 – 9 | US 7.5 – 10 |
| Large | US 9 – 11 | US 10 – 12 |
| X-Large | US 11.5 – 14 | US 12.5+ |
Get To Know Our Yarn
Feel
Cushioned sole, mid compression, comfort +
Best For
Gym, running, tennis, all-day wear
Fabric
BCI Cotton, CiCLO Nylon, CiCLO Poly
Technology
CiCLO® biodegradable yarn
Premium performance yarns sourced from a family-owned mill in the U.S. — independently tested free from PFAS | BPA and screened for 100+ chemicals. Engineered to last over 10,000 miles. Our standard is simple: if the lab's instruments can find it, we don't use it.
Independently tested and screened for 100+ chemicals. Every result available to you. See our standards →
Overall rating: 5.0 / 5 from 13 reviews.
Review topics: [fit, quality, comfort, socks].
"These socks truly match or top the performance and feel of the best socks out there without using materials with pthalates, BPA or other harmful materials."
"Me new go to for the in between seasons before I break out the smartwools for warmth."
"They work like socks"
"These socks are super comfortable and great quality. I am so glad I bought multiple pairs!"
"I can finally lift weights or run without getting getting bogged down in sweat like I used to in a cotton t-shirt"
"These are fantastic socks. Incredibly soft but they hold their shape well. Mine have nice longevity so far with very heavy use. I much prefer the simple blue stripes to a swoosh any day. You’ll want to buy multiples."
"Fabric feels nice. Not too thick and comfortable. Perfect crew sock."
"High-quality, comfortable, I love wearing them for workouts and long runs"
"love them!"
"Perfect thickness for workout shoes, boots, they fit snug and do not move!!"