Size options

When a product has various size options available, it is important that the sizes are specified in a standard and consistent manner.

Having consistent sizes helps the customer find the right product variant when searching and removes duplication from the size filters.

Sizes must also conform to third party sales channel requirements and best practice. For example  Amazon and Google standards.

Size

Mostly used for clothing, but also for other products such as helmets and masks. Note: the inconsistency between XXS and 2XL is intentional and conforms with general best practice.

Correct Values	Incorrect Values
XXS	xxs, Xxs, 2XS, 2xs, 2 XS, 2 xs, 2X small, 2 extra Small
XS	xs, Xs, extra small, Extra Small, Xsmall, x-small
S	s, small, Small
M	m, MED, MEDIUM, Medium, MEDIUM MENS, WOMENS MEDIUM
L	l, large, Large,, Large Mens, WOMENS LARGE
XL	xl, XLARGE, X-LARGE, EXTRA LARGE, XLARGE MENS
2XL	2xl, 2-XL, XXL, XXLarge, XX-Large, 2XLARGE MENS, XXLARGE MENS
3XL	3xl, 3-XL, XXXL, XXXLarge, XXX-Large, 3XLARGE MENS, XXXLARGE MENS
4XL	4xl, 4-XL, XXXXL, XXXXLarge, XXXX-Large, 4XLARGE MENS, XXXXLARGE MENS

Size Range

When specifying a size range the same standard sizes in the above table should be used with a single dash separator and no spaces.

Correct Values	Incorrect Values
XS-S	xs-s, XS – S, XS/S, XS / S, XSmall / Small
XS-M	XS / M, XS / S / M, XS / S / MED, XSMALL – MED, XSMALL – MEDIUM
S-M	s-m, s – m, s/m, s / m, S – M, S/M, S / M, SMALL / Medium, small – Medium
M-L	m-l, MED-LRGE, MEDIUM – LARGE, Medium / Large, MEDIUM / LARGE MENS
L-XL	l-xl, l – xl, L – XL, l / xl, large / XLarge, Large – XLarge,, Large/XLarge Mens, L-XL Mens
XL-2XL	xl-2xl, XL / XXL, XL / 2XL, XLARGE – 2XLARGE, X-LARGE – XX-Large, EXTRA LARGE / 2-X LARGE
2XL-3XL	2xl – 3xl, 2-3XL, XXL / XXXL, XXL – XXXL, XXL-XXXL, XX-Large/3X-LARGE MENS

Multiple Size Values

Products may have their size expressed in multiple sizes to give more precision e.g. S (49-53cm) or L-XL (57-63cm). The correct way to represent these products is to strip out the size details and make sure this is presented either in the Size Guide tab of the product page or in the product description. This is typically done by including a size guide table/image (or both) which details all the possible sizes. The size option can then be simply described in the standard size terms e.g. S or L-XL.

Correct Values	Incorrect Values
S	S (49-53cm), S 49-53cm, Small 49 – 53 CM, Small – (45-53 CM)
L-XL	L-XL (57-63cm), L-X 57-63cm, Large-XLarge (57cm-63cm), L – XL (57 – 63 cm)

One Size

It is generally bad practice to include a size option for a product when it can only ever be one value, however, “One Size” is an exception to this rule when it relates to an item that is only made in one size but the customer might not realise this, such as caps, buffs, etc. In these cases, specifying the size as “One Size” reinforces to the customer that the product comes in just one size.

Some “One Size” products have the minimum and maximum size range expressed to give more precision e.g. UNISIZE (54-61cm). The correct way to represent these products is to strip out the size details and make sure this is presented either in the product description or the Size Guide tab of the product page. The size option can then be simply described in the standard size term “One Size”.

• if a product is made in multiple sizes, but only one is stocked, the size option should be set to the actual size of the stocked item, not “One Size”, even if the size is included in the product title. For example, if a shoe is only stocked in size 48, do not create the product with “size 48” included in the title and set the size option to “One Size” – instead, set the size option to “48”.

Correct Values	Incorrect Values
One Size	One size, one size, ONE SIZE, ONESIZE, UNI-SIZE, UNISIZE, One size fits all
One Size	One Size (50-70 cm), UNISIZE (54-61cm)

Women’s Clothes Size

Simply use the numeric size/size range. Don’t include spaces.

Correct Values	Incorrect Values
8	Size 8
8-10	8 – 10, 8 to 10, Sizes 8-10

Children’s Age Size

Ages should be specified in Years with just the first letter capitalized and a single space between the number/range and the unit of measure. No spaces should be used in the range element.

Correct Values	Incorrect Values
8 Years	AGE 8, Age 8, 8 Years Old Small (Age 8 Approx), Small – Age 8 approx.
8-10 Years	AGE 8-10, Age 8 – 10, 8 – 10 Years Old Small (Age 8 – 10), Small – Age 8 – 10 approx.

Footwear Size

Footwear should be expressed in European sizes. The Size Guide tab of the Product Page should include a table (or image) showing the equivalent UK sizes.

Correct Values	Incorrect Values
42	8.5, UK 8.5, 8.5 UK, 9 US, 42 EU
42-43	9, UK 9, 9 UK, 9.5 US, 42-43 EU
42 Wide	8.5 Wide, UK 8.5 (W), 8.5 (Wide) UK, 9 – Wide US, 42 (Wide) EU

Fractions

When expressing a number as a fraction, use a single space to separate the whole number (integer) part from the fraction part. Do not use a dash.

When specifying a size as a decimal fraction it is okay to show a zero in the tenths column, but do not include trailing zeros in any other columns e.g. the hundredths or thousandth columns.

Correct Values	Incorrect Values
1 1/2	1-1/2, 1 – 1/2
2 1/5 inch	2-1/5 inch, 2 – 1/5 inch
2.0	2.00
2.1	2.10
2.5 inch	2.50 inch

Units of Measure

Units of measure must be specified in lower case with a single space between the value and the unit of measure.

Correct Values	Incorrect Values
3 m	3m, 3 Metre, 3Metre, 3 METRES, 3meters, 3 METERS
2 cm	2cm, 2 Cm, 2CM, 2 CM
2 mm	2mm, 2 Mm, 2MM, 2 MM
4 ft	4 Feet, 4 Foot, 4 FEET, 4′, 4 ‘, 4 Ft, 4 FT, 4Ft, 4FT
2 inch	2 INCHES, 2 INCH, 2″, 2 “, 2 in
4 kg	4kg, 4 KG, 4KG, 4KGS, 4KGs, 4 KILO, 4 Kilos
2 g	2g, 2 G, 2G, 2 grams
2 lb	2lb, 2 LB, 2LB, 2LBS, 2LBs, 2 pounds, 2 Pounds
8 oz	8oz, 8 OZ, 8OZ, 8OZS, 8OZs, 8 ounces, 8 Ounces
3 litre	3l, 3 l, 3L, 3 L, 3 Litre, 3 LITRES
2 ml	2ml, 2 Ml, 2ML, 2 ML

Dimensions

When specifying dimensions, use a lower case ‘x’ as a separator with a single space on either side. Include the unit of measure at the end in lower case, with a single space as a separator. 

Correct Values	Incorrect Values
10 x 26 x 8 mm	10X26X8MM, 10 X 26 X 8 MM, 10 X 26 X 8 mm, , 10 x 26 x 8mm
12 x 28 x 8 mm	12X28X8MM, 12 X 28 X 8 MM, 12 X 28 X 8 mm, , 12 x 28 x 8mm

Chainset, Sprocket and Cassette Sizes

A capital letter ‘T’ must be used when specifying the number of teeth. No space should be used between the number and the T. If there is a range or sizes, the lowest and highest number should be separated by a hyphen (-) and no spaces. If there are multiple specific sizes, these should be separated by a forward slash (/) and no spaces.

• The size attribute should not be used for gear speed – use the fitting attribute instead. For example, products for 9x or 9 speed gears should be given a fitting attribute of 9-speed.

Correct Values	Incorrect Values
172 mm 34/50T	172 50/34, 172mm 50/34, 172 50 / 34 T, 172 MM 50 / 34 T
9T	9 TEETH, 9TEETH, 9 Teeth,9 T
11-25T	11-25 TEETH, 11-25 teeth, 11 – 25 T, 11-25t
42/32/24T	42/32/24, 42 / 32 /24, 42/33/24 T, 42 / 32 /24 T

Wheel and Tyre Sizes

Correct Values	Incorrect Values
650 C	650C, 650c, 650 c
29 inch	29inch, 29″
700 x 23 C	700x23C, 700x23c, 700 X 23C, 700 x 23c, 700 x 23 Mm, 700 x 23 mm
700 x 35-45 C
26 x 3.8-5.0 inch
20 x 2.00 inch (54-406 mm) 60 TPI

Unusual Sizes and Terms

Correct Values	Incorrect Values
70-109 mm ITA	IT 70 – 109 MM, IT70 – 109 MM, IT 70-109MM
36 hole	36 Hole, 36 holes, 36 HOLE, 36 HOLES
axle	AXLE, Axle
BSA	bsa, Bsa, B.S.A., b.s.a.
116 Links	116LINKS, 116 LINKS, 116links, 116 links, 116Links, 116L
15 lumens	15 LUMENS, 15lumens, 15Lumens, 15lmn, 15lms, 15LMS, 15 LMS
15/7 lumens	15 / 7 LUMENS, 15 / 7 lms, 15 || 7 lms