47-50. One sock, four shoe sizes. That is why it never fits.
If you wear EU 48 or above (US 14 and up), you know the label. "47-50", sometimes "47-49", rarely "51-54". It sounds like a size. It is one knitted size for a span of almost three centimetres of foot length, and whatever the knitting does not cover, the stretch is asked to. That is why your socks slide at the heel, dig into the calf and look after ten washes like after a hundred.
What the label says, and what gets knitted
A sock does not have a size the way a shoe does. It has a sole length, a leg length and a width, all measured relaxed. A circular knitting machine produces exactly one combination of those per programme. When the label says "47-50", one single length was knitted, and the manufacturer promises that the stretch of the fabric will take care of the rest.
How much rest that is can be calculated. Between shoe sizes 47 and 50 lie three EU sizes, three times two thirds of a centimetre: around two centimetres of last length, and about as much between the feet that go in them. The sock is usually designed for the middle or the lower end of the span. For a size 50 foot that means two to three centimetres are missing, every single day.
What happens when you stretch across four sizes
Knit fabric is a grid of loops. Pull it lengthwise and the loops are drawn out and become narrower, the fabric thins, and the material contracts in width. Every sock does this a little, and a little is intended. Across four shoe sizes it turns into a pattern you know:
- The heel migrates. The knitted heel pocket sits where a size 47 heel is. On a size 50 it lies under the arch. Your heel bone is wrapped in sole fabric that was never shaped for it.
- Toe and heel go thin. The most stretched areas are the most loaded ones. That is where skin chafes first and where the yarn gives out first.
- The leg strangles. What is pulled in length loses width. Add that a big foot usually hangs off a big calf. The result is the ring on your shin in the evening.
- The stretch gets tired. Elastane takes a lot, but not permanent pull plus a washing machine. After a number of washes the sock stays longer, but not in shape. Then it fits neither a 47 nor a 50.
Why manufacturers do it
Not out of malice. Every extra size is its own machine programme, its own stock position and its own minimum quantity. Above 46 the quantities get small fast for a large manufacturer. So they consolidate: one length, a wide label, and the customer in size 50 only notices at home. For the manufacturer it adds up. For you it does not.
How to tell a stretched sock
Put on one of your socks and look. Is the heel seam under the ankle bone instead of behind it? Can you see skin through the toe? Does the cuff leave a ring after a few hours? Do you have to tug at the leg to get your foot in? Every one of these means the sock was knitted in a length that is not yours.
How it is done properly: length, not stretch
The sock in the shop
One knitted size, label 47-50.
Missing length comes from stretch.
Leg and cuff as for a size 42.
Elastane as a substitute for size.
OFFSCALE
Three brackets of two shoe sizes each: 46-47, 48-49, 50-51.
Sole 28, 30 and 32 cm, knitted in; leg 26, 28 and 30 cm.
Leg and cuff wider from 48-49.
3% elastane for hold, not for length.
Two shoe sizes per sock is what the industry has always done in average sizes: 39-42 is often really 39-40 and 41-42, or single sizes altogether. Above 46 we do nothing different. It is not a feat, it just was not worth anyone's trouble until now.
The 52-53 bracket with a 34 cm sole is developed and waits for enough people to ask. Larger than that we count as well. The size guide shows which bracket is yours.
The industry was too small.
Six dress-sock designs from EU 46, knitted to length. First run winter 2026.
Frequently asked questions
Does a 47-50 sock fit shoe size 50?
You can put it on, but it does not fit: the sock is knitted in one length designed for the lower half of the span. At size 50, two to three centimetres are missing and have to come from stretch. The heel slides under the foot, toe and heel go thin, the leg digs in.
What does 47-50 mean on socks?
That a single knitted size is sold for shoe sizes 47, 48, 49 and 50. The label describes the range the manufacturer trusts the stretch to cover, not four different socks.
Why do large socks dig into the calf?
Because knit fabric pulled lengthwise gets narrower, and because most large socks have the same leg circumference as smaller ones. OFFSCALE knits leg and cuff wider from 48-49 upward.
Which socks exist for shoe size EU 52 and above (US 17+)?
Very few, and mostly sports socks. OFFSCALE has developed a 52-53 bracket with a 34 cm sole and knits it as soon as enough people have reserved it. Register your size in the form on the home page.
Are OFFSCALE socks single sizes?
No, pairs of sizes: 46-47, 48-49 and 50-51. One shoe size, just under seven millimetres, is what a sock covers cleanly with tension. Four sizes is not.