1. How do you fit AutoSock?
Please have a look at the video on the Home page.
If you can't get your forearms into the space between the top of the wheel
and the wheel arch then you won't be able to fit AutoSock - check out your
options on our snow chains pages.
2. How do AutoSock snow socks work?
It's to do with friction, specifically dry friction.
Dry snow and ice sticks to fabric, especially 'woolly' fabric as those
of us who used to snowball in woolly mitts will remember.
AutoSock are made from a hairy fabric which sticks to the snow.
The fibres in AutoSock, which become hairier with use, are arranged at
right angles to the direction of travel to optimise grip.
Very importantly, AutoSock's specially developed 'GripTech' textile
also absorbs and “wicks away” any water that's found between
the ground and the tyre, (generated e.g. by the warmth of the sun,
or by wheel spin), thereby maximising the dry friction grip.
AutoSock work well in warmer slushy snow as well as cold, dry snow.
AutoSock's unique fabric was developed in Germany by KoSa and DuPont
Textiles, both subsequently part of Koch Industries' INVISTA business,
now the world's largest manufacturer of polyester products.
AutoSock's fabric is still made in one of KoSa's EU mills.
3. How well do AutoSock work?
Astonishingly well! They are more effective (short term only) than
winter tyres (and a lot cheaper) and are also more effective than snow
chains in many situations, especially on ice.
Don't just take our word for it - they have been tested and formally
approved by Bentley, BMW, Citroen, Hyundai, Jaguar Land Rover,
Mercedes-Benz, Mini, Peugeot and Volkswagen, as well as by several
European road transport research institutes and the German TÜV.
A range of test data is shown on the Research and Development section
of About us.
4. What size do I need?
Please check the size finder.
If you can't find your tyre size, double check you have noted it
correctly, then as necessary e-mail
[email protected].
BMW drivers should note that the rear wheels are often a different size
to the front wheels, and that it's the rear (driving) wheels you need
to check.
5. When should AutoSock be fitted and removed?
There are no rules about this. Some people use AutoSock because they
are anxious about driving in snow, and want to be sure that their
vehicle will stay on the road. Others need to use AutoSock to drive
safely, especially driving down steep hills. Others fit them after
they have got stuck. Others use them to drive uphill, maybe even just
from the main road up to their house.
Use them on any sort of snow - even in soft, deep snow, or in wet snow.
And use them on ice. Can AutoSock be used on tarmac? See Q6.
6. Can AutoSock be used on tarmac?
In summary, yes, and for safety reasons you will need to use
them on tarmac - it is obvious that you should not and must
not just stop in the middle of a road, just because you have moved off
the snow and onto tarmac. The reality is that there are almost always
stretches of intermittent tarmac / snow / tarmac / snow before the snow
is behind you.
The TÜV test included 50 kilometres at 50 kph on dry tarmac.
AutoSock passed this "Misuse test", but of course tarmac driving is not
recommended as it increases fabric wear very considerably.
It's also crucial that you do not drive faster on tarmac than you would
on snow, a maximum 30mph, preferably slower than this.
What causes AutoSock to wear fastest of all is rough, potholed tarmac,
or roads with tyre ruts / tramlines that have frozen solid.
This compressed frozen snow or ice can be very sharp, and is often
hidden under fresh snow.
If you do drive on tarmac, be very careful with your braking, so please
adjust your speed accordingly. A large hole worn in one section only of
an AutoSock is conclusive evidence of hard braking on tarmac.
7. What's it like, driving on AutoSock?
Silent and smooth, as you'd expect. There's none of the loud rattling
and bumpy ride associated with snow chains. Because there's no danger
of damage to the vehicle structure they are approved for speeds up to
30mph / 50kph; this is faster than is recommended with snow chains,
although your speed should of course be appropriate to the weather
and road conditions.
8. Do I need to turn off any electronic systems when using AutoSock?
No you don't. You can use them with your vehicle's electronic aids
left on, unlike most snow chains (except Spikes-Spider) which should
normally NOT be used with traction control and anti skid devices
(e.g. ESP / ASC+T / ASR / ABS).
AutoSock are breathable so there's no adverse effect on brake cooling.
9. I have a 4x4. Which wheels should AutoSock be fitted to?
It's recommended that you fit them to all four wheels.
If you only have one set, please refer to your user manual;
some manufacturers recommend the rear wheels, some recommend
the front wheels.
10. I have a rear wheel drive. Do I need AutoSock on the front wheels
as well?
You don't need them, but it obviously makes sense to fit
AutoSock to the steering wheels as well as to the driving wheels,
because the car will then travel in the direction you intend!
Because the weight moves towards the front of the car under
braking - brake gently on snow! - this is all the more important
A reminder to BMW owners to check their rear wheel size!
11. My AutoSock have small holes in them. Does this matter?
No. This should be expected. AutoSock will wear out as they are
used, but they should last a lot longer than the copy products -
see below. Please see these
wear notes.
12. What about when I take them off?
They're likely to be wet and probably dirty.
It's sensible to have a large plastic bag to drop them into.
When you get home, dry them out - stick them in the washing machine
if you wish or wash then out in hot soapy water - but be sure to put
them back in the car for next time!
13. Are AutoSock approved for use in the Alps, where
“snow chains” are compulsory?
AutoSock is the first snowsock product worldwide to have been
tested and approved to the European standard EN16662-1:2020 for
"supplementary grip devices" - this includes not only metal snow
chains but also devices made from other materials.
The standard covers passenger cars and light commercial vehicles
up to 3.5 tonnes gross vehicle weight; we have no idea whether
any other snowsocks have met this standard.
This standard has been implemented in all EU member states except
for Austria, as well as in Norway, Serbia, Switzerland,
and Turkey.
In France, the new “Mountain Law”
(“Loi Montagne”) requires that winter equipment must
be carried on special road sections in mountainous areas between
November 1st and March 31st. AutoSock for passenger cars and light
commercial vehicles fully complies with this new regulation and
can legally be used instead of snow chains or winter tyres when
entering any of these areas.
14. Do AutoSock work on grass or in mud?
They do make a difference on wet grass, but as soon as it gets
muddy - which is usually very rapidly - they are useless.
(We have chain systems that make light work of mud!)
15. The tyre tread is covered by the fabric. Is this legal?
We don't know. The law has not caught up with these products.
What we can tell you is
(1) we don't think that the law specifically requires the tyres
to be actually touching the road;
(2) tyres with snow chains fitted have the same issue, and nobody
asks this question about snow chains;
(3) we supply many police services with AutoSock;
(4) you will surprised to see sharply defined tyre tread marks
appearing in the snow;
(5) to make sure that your tyres are legal!
16. I already have AutoSock; will they fit my new car?
Check your new tyre size to see what size we list.
If your AutoSock are not listed, check
here
which is a list of discontinued AutoSock applications.
17. Do you exchange AutoSock?
We don't exchange AutoSock, sorry, even if completely unused.
We suggest that you sell or give them to a friend, or sell them
e.g. on eBay.
18. I can buy snow socks for £35. Why should I pay £50
to £70 for AutoSock?
AutoSock are the best, which means that
- (1) they will perform better overall than the copies
- (2) they should last longer than the copies
- (3) they have passed all appropriate safety tests
- (4) they have full product liability insurance
The bottom line here is that, especially after the 2010 winter,
there are still numerous other snow socks on the market, some of
which are sold by big names in the retail sector, but all of which
are potentially infringing AutoSock's patent. Some of these have
already been proved in court judgments to be doing so, and other
court cases are ongoing.
Some of the snow socks being sold in the UK market have already
been banned elsewhere. It is unfortunate that the UK is used as
a dumping ground; by the time the lawyers catch up with some of
these retailers (who tend to operate via new limited liability
companies), the stock has been sold and the proceeds disbursed.
Most of the better quality “copier developers” now have
second generation products in the UK, requiring a new set of legal
challenges.
AutoSock's general problem with copiers is that at a superficial
level these snow sock products are both simple and cheap to make,
which is why there are so many poor quality Chinese copies as well
as some much better quality European ones.
The reality is that complex science underpins not only the theory
but also (1) AutoSock's high tech materials and (2) the details of
the construction and sizing which ensures good performance, safety,
and an acceptable wear rate. As well as using superior materials,
AutoSock AS of Norway have also needed to factor their many years
of development work into their pricing, something which the copiers
don't have to do.
AutoSock's lawyers are also making progress with some of the very
cheap products. Some of these are of such poor quality that they
are a potential consumer safety hazard; Trading Standards are being
made aware as appropriate.
How come some other snow sock brands also warn customers
to be careful of copiers?
Another smoke and mirrors tactic used by many of the better quality
copiers is to include devices in their latest generation copies
which they think might help to get around AutoSock's patent, e.g.
including plastic mesh, or an elastic strap, in the road contact
fabric. (Managing wear rate was an important part of AutoSock's
development work over many years. It was found that, to minimise
wear rate, an AutoSock needs to be allowed to rotate around a wheel
- these full rotations happen surprisingly often.
This science is at the core of AutoSock's patent.
Using an elastic strap to hold the fabric against the wheel is
therefore not likely to be a sensible thing to do!)
Some copier web sites claim that “open face designs”
are superior because there is no risk of snow building up inside
the sock (which doesn't happen) and because you can still pump up
your tyres when snow socks are fitted - which is true but almost
irrelevant! AutoSock's mesh helps to provide stability in use as
well as allowing the AutoSock to self-centre faster.
Our fleet customers will also be interested to know that AutoSock's
manufacturers have the relevant ISO and OHSAS approvals.
The products themselves are, of course, properly TÜV and Ö
NORM approved; one of the better copiers, which claims to have
these approvals, and has even produced certificates, does not in
fact have TÜV and ÖNORM approvals!
AutoSock is made from a specially developed woven fabric.
It is important to note that no copy shares this fabric, and that
some fabrics have very poor water absorption characteristics
(remember that the aim is to maximise dry friction) so they are
much less effective on wetter snow in particular.
Some snow socks are made from a black knitted material which,
once it starts to wear, wears relatively quickly.
It's the same material which is used in grass catching bags.
Business and fleet customers will only be reading these notes if they're looking at options for being able to 'keep on trading' in snowy weather. The following note (1) makes a business case for adding AutoSock to this list of options and (2) aims to explain that, when comparing AutoSock to other snow socks, you are comparing chalk and cheese.Every component in an AutoSock has a purpose in design and quality – the road contact fabric, the number of straps, the front mesh. Most of the copiers have copied the concept without understanding the engineering, doing it as cheaply as possible, which is why some copies don’t last as long and are prone to failure, e.g. being dragged behind the wheel when cornering in wet snow. Both we and AutoSock in Norway have tested many of these products and, even just looking at them side by side with AutoSock, we know that we wouldn't want to trust them on our family cars or Company vehicles. Driving in snow is already much more dangerous than normal driving - this is not a time or place for cutting corners!
Please click on the pdf symbol to read 'AutoSock - the business case':

If you are looking to order more than 10 pairs of AutoSock, please note that there's a tool available at autosock.co.uk/fleets where you can work out what sizes you need, can save your work, and can then send it to us if you want a quote.
AutoSock, based in Oslo, created and developed the "car snow sock" concept, working closely with the German TÜV, and is the registered holder of all relevant patents. Their main European Patent is EP 1165329 which is operational in all European countries. They have similar patent protection in North America and Japan.
AutoSock continue to robust action against patent infringement - we think it's important that their corporate customers in particular are aware of this, because they may well have responsible sourcing standards.
AutoSock are made from science-based, high tech materials. The road contact fabric was specially developed to maximise dry friction, and be very hard wearing. The mesh facing helps provide stability, as well as making for much easier fitting. It’s important to have an open mesh, allowing powder snow to be flung out, as otherwise powder snow is likely to bulk up inside the sock. We have seen how socks without a front mesh can fall behind the wheels, especially when they are on a tight lock, and especially in wet snow. The mesh facing is therefore a very important part of the design, but unfortunately it’s not a cheap component.
After the winters of 2009 and 2010 in particular, large numbers of copy products entered the UK and Irish markets; legal activity for patent infringement has been taken, is in progress, or may be taken against many of these distributors and resellers, some of whom are household names and, we can only assume, have been badly advised!
Some of the copies and counterfeits are relatively very cheap - as products can be if there are no research and development costs, if materials are of poor quality, if important elements of what makes a safe product are not included at all, and if the labour costs are negligible.
We hope that our potential fleet customers in particular will wish to be confident that the products they use have proper product liability insurance, as AutoSock has.
Some of the distributors of copy products continue to make unjustified statements about their products. For example, some claim to have German TÜV testing agency approvals, but in fact their TÜV certificate attaches to something else entirely, not to their snow sock copy; only AutoSock has been tested by TÜV against the TÜV standard for snow socks in force at that time.
EU court decisions include:
- A preliminary injunction for breach of patent against Siepa and its Austrian and German distributors by the Higher District Court of Düsseldorf, Germany. The penalty for a violation of the judgment is up to €250,000 per incident. Siepa 'brands' include Goodyear and Fix&Go.
- An injunction for breach of patent against the Trendy distributor in Norway by the Court of Telemark.
- A preliminary injunction for breach of patent against one embodiment of MultiGrip by the Higher District Court of Düsseldorf. The penalty for a violation of the judgment is up to €250,000 per incident.
- A judgment on 20th November 2014 against Weissenfels S.p.A. for breach of patent. Weissenfels were required to pay the court costs, and to refrain from selling snow socks (including WeissSock) in Germany again, with a penalty of EUR 250,000 for each and every violation, and to provide AutoSock with a detailed history of sales and profits since 14th January 2006.
For many years AutoSock was the only snow sock that was approved for use in many European countries as an alternative to snowchains, including France, Germany, Italy and Spain, but since 1st December 2020 new legislation is in force, with a new testing standard, and previous arrangements are now obsolete.
The new standard EN16662-1:2020 is for "supplementary grip devices" - these include not only metal snow chains but also devices made from other materials. The standard covers passenger cars and light commercial vehicles up to 3.5 tonnes gross vehicle weight.
AutoSock is the first snowsock product worldwide to have been tested and approved to EN16662-1:2020; we have no idea whether any other snowsocks have met this standard.
This standard has been implemented in all EU member states (except for Austria), and also implemented in Norway, Serbia, Switzerland, and Turkey.
AutoSock are lobbying for Austria to follow European legislation and to adopt EN16662; until further notice ski-drive visitors to Austria should take snowchains - but AutoSock will of course also be useful on the non-driving wheels, and on slushy roads where snowchains are useless.
In France, the new “Mountain Law” (“Loi Montagne”) requires that winter equipment must be carried on special road sections in mountainous areas between 1st November and 31st March. AutoSock for passenger cars and light commercial vehicles fully comply with this new regulation and can legally be used instead of snow chains or winter tyres when entering any of these areas.
There is a generally a very robust argument for carrying snowchains as well as AutoSock when driving in Alpine regions - see our Snow Chains pages for more information about this.