Sock sizes are based on length and volume. If you are between sock sizes and if you have a narrow foot (width D or less) then you should choose the smaller sock. For unisex socks, women should choose the smaller sock if they are on the border between sizes because women's feet, for a given size, often have a smaller volume than men's feet.
Generally, technical socks should have a tighter fit than normal socks. The below table contains details for X-Socks, Thorlo, Bridgedale and Sealskinz socks.
Click this link for a detailed shoe size conversion chart.
X-Socks Unisex/Men's | Code | UK Size | Euro Size | US Men | US Women |
1 | 3-5.5 | 35-38 | |||
2 | 6-7.5 | 39-41 | |||
3 | 8-9.5 | 42-44 | |||
4 | 10-12 | 45-47 | |||
X-Socks Women's | Code | UK Size | Euro Size | US Men | US Women |
1 | 2.5-3.5 | 35-36 | |||
2 | 4-5 | 37-38 | |||
3 | 5.5-6.5 | 39-40 | |||
4 | 7-8 | 41-42 | |||
Thorlo Unisex | Code | UK Size | Euro Size | US Men | US Women |
9 | 2.5-4.5 | 35-37 | 3-5 | 4-6 | |
11 | 5-8 | 38-42 | 5.5-8.5 | 6.5-10 | |
13 | 8.5-12 | 43-47 | 9-12.5 | 10.5-13 | |
15 | 12.5-14 | 48-50 | 13-15 | ||
Thorlo Level 1 & Women's | Code | UK Size | Euro Size | US Men | US Women |
9 | 3.5-5 | 36-38 | 5-6.5 | ||
10 | 5.5-7.5 | 39-41 | 6-8 | 7-9 | |
11 | 8-9.5 | 42-44 | 8.5-10 | 9.5-11 | |
12 | 10-11 | 45-46 | 10.5-11.5 | ||
14 | 11.5-13 | 47-49 | 12-14 | ||
Bridgedale Unisex/Men's | Code | UK Size | Euro Size | US Men | US Women |
S | 3-5.5 | 36-39 | 4-6.5 | ||
M | 6-8.5 | 40-43 | 7-9.5 | ||
L | 9-11.5 | 44-47 | 10-12.5 | ||
XL | 12+ | 48+ | 13+ | ||
Bridgedale Women's | Code | UK Size | Euro Size | US Men | US Women |
WS | 3-4.5 | 35-37 | 4-6 | ||
WM | 5-6.5 | 38-40 | 6.5-8 | ||
WL | 7-8.5 | 41-43 | 8.5-10 | ||
Sealskinz | Code | UK Size | Euro Size | US Men | US Women |
S | 3-5 | 36-38 | |||
M | 6-8 | 39-42 | |||
L | 9-11 | 43-46 | |||
XL | 12-14 | 47-49 | |||