UK and European sock and shoe sizes

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:

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