OS1st Unisex AC4 Active Comfort No Show Socks

Made for staying comfortable all-day and any activity with plush bamboo charcoal cushion in the heel and toe and ultra-thin Skin Thin™ cooling panels on the top. For the best fit, it is important to use the size chart before ordering.

• Extra cushion in the heel and toe
• Bamboo charcoal ionized fibers for durable softness
• Ultra-thin top panel to regulate temperature and increase air flow

Included in all Socks with Purpose®

• Micro-nylon treated with silver-ion technology to keep dry and prevent odor
• Seamless construction and left/right design for 360-degree blister protection
• Y-Gore heel to prevent the sock from slipping down into your shoe

Care Instructions: Wash gentle on cold. Tumble dry on low heat. No bleach or fabric softener. 

Most orders ship within 1 business day

During busy seasons, processing may take up to 2 days

Same‑Day Shipping

Mon–Fri: Orders placed by 12 PM EST
Saturday: Orders placed by 10 AM EST
Orders placed after these times, on Sundays, or on holidays ship the next business day

Free Shipping
Free shipping on all U.S. orders over $75 (continental U.S.)

Carriers Used
Orders ship via USPS or UPS
Weekend/late‑Friday orders may ship USPS to meet timing requirements

Alaska, Hawaii, Military & U.S. Territories
Shipped via USPS Standard/Priority Mail
Typical transit times:
AK/HI/Territories: ~3 days (not guaranteed)
Military addresses: 10–15 days

Transit Times
USPS Priority Mail may display “1‑Day,” “2‑Day,” or “3‑Day,” which reflects USPS’s estimate after the package ships
These estimates do not include processing time.

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