Socks Size & Fit

Darn Tough

Size Chart

Sock Size Men US Women US* Euro UK
XS 2.5-5 4.5-7 35-38 2.5-4.5
S 5.5-7.5 7.5-9.5 38-40 5-7
M 8-9.5 10-11.5 41-42 7.5-9
L 10-12 12-14 43-45 9.5-11.5
XL 12.5-14.5 — 46-47 12-14
XXL 15-17 — 48-50 15-16

 

Sock Height

Graphic showing sock heights compared to each other for sock sizing chart help

Sock Height by Inches

We measure from the heel to the cuff of the sock. A ruler or measuring tape can help you determine where the sock will reach on your leg, but results may vary based on your individual leg length.

 

Sock Height Men / Unisex Women
No Show Hidden / No Show Invisible 2" 1.75"
No Show Socks / No Show Tab 3.5" 2.75"
1/4 (Quarter) Socks 5.5" 5.5"
Shorty Socks — 5.75"
Micro Crew Socks 8.5" 7.5"
Crew Socks 10.5" 8.5"
Boot Socks 11" 10.5"
Mid-Calf Socks 12" 12"
Over-the-Calf / Knee High Socks 17" 16.25"

 

Sock Cushion

Cushion is a padding within the sock created by knit terry loops. The cushioning provides added protection in high impact areas, shock absorption, and extra warmth and comfort. 

1. No Cushion Socks: A thin knit with no lift from terry loops in the socks. Regardless of yarn weight, this is a thin sock.

2. Cushion Socks: Terry loops underfoot and other areas of the sock, but does not wrap the foot. Our most popular, versatile cushion style.

3: Full Cushion Socks: The terry loops run the entire length of the sock, or at least up to the cuff, for a full wrap of cushion around the foot and leg.

A few of our Ski & Snowboard Socks feature targeted cushioning in the shin that is separate from the foot. 

Sock Weight

Yarn comes in weights, and while measured in microns, it can make a difference. What you might consider outdoor socks are midweight and higher. For categories like our running socks, skiing socks, and casual socks, ultra-lightweight and lightweight are standard.

  1. Ultra Lightweight Socks: The absolute lowest profile that is nearly a second skin. Even with cushion, these socks are sleek and silky smooth.
  2. Lightweight Socks: The most versatile weight found in practically every sock category. When accompanied with cushion, some consider this weight the most sublime combination we knit.
  3. Midweight Socks: With the outdoors in mind, this is where our hiking socks and ski socks made their name. More natural insulation, and so durable they are a thru-hiker staple.
  4. Heavyweight Socks: Our warmest socks. Always with cushion, if not a full cushion of terry loops, these usually have the highest merino wool content of any styles with maximum Merino benefits.

Smartwool

Men's Smartwool Socks Size Chart

Size U.S. Men's Shoe Size Euro Shoe Size UK Shoe Size Calf Circumference (Largest part of the calf)
S 3-5.5 34-37 2-4.5 11"-14.5" (18-26.5 cm)
M 6-8.5 38-41 5-7.5 12.5"-16.5" (32-41 cm)
L 9-11.5 42-45 8-10.5 14.5"-18" (37-45.5 cm)
XL 12-14.5 46-49 11-13.5 16"-23" (41-58 cm)

Women's Smartwool Socks Size Chart

Size U.S. Women's Shoe Size Euro Shoe Size UK Shoe Size Calf Circumference (Largest part of the calf)
S 4-6.5 34-37 2-4.5 11"-14.5" (18-26.5 cm)
M 7-9.5 38-41 5-7.5 12.5"-16.5" (32-41 cm)
L 10-12.5 42-45 8-10.5 14.5"-18" (37-45.5 cm)
XL N/A 46-49 11-13.5 16"-23" (41-58 cm)

 

Smartwool Socks Size Chart – Climb On Equipment