So Ill Approach Shoes & Footwear Size Chart, Guide & Fit Advice

Mondo Sizes
So Ill footwear uses the Mondo sizing system, where each whole size is equivalent to exactly 1cm in length.  To ensure the best fit we recommend you:

    ●  If you have owned So Ill before, buy the same again, their sizing has not changed.

    ●  Shop using Mondo, UK or US men's sizes.

    ●  Follow our "How to Measure Your Mondo Size" advice and video lower down this page.   

UK Sizes
Correct as shown below, rue fit right out of the box, no need to go up or down a size.

US Sizes
So Ill's US sizes for men are correct, as shown below.
So Ill's US sizes for women are a half size under sized so, if your normal shoe size is US Womens 8, buy a So Ill US Women's 8.5.  The "Absolute" column shoes the correct US Womens size conversions from Mondo.

EU Sizes
So Ill's translation' to EU sizes is different to most other brands and is not quite correct.   If you prefer to use EU sizing we have added an "EU Absolute" column showing the correct conversion from Mondopoint.  EU shoe sizes increase in 3.333mm increments - which is why, when presented to a single decimal point, they should always end with .0, .3 or .7 and never with .5.

On Our Website.....
On our website we use So Ill sizes (even though they are not always correct) because these are what appear on the shoe boxes and the shoes themselves.

So Ill Approach Shoe & Footwear Sizes

 Size Conversions by:
  So IllAbsolute
MondoUKUS Men'sUS Wmn'sEUUS Wmn'sEU
278910.5421042 42.5 42.7
28910 43 43.3
28.59.510.5 44 44
291011 44.5 44.7
29.510.511.5 45 45.3
301112 46 46
30.511.512.5 46.5 46.7
311213 47 47.3
31.512.513.5 48 48
321314 48.5 48.7
32.513.514.5 49 51.3
331415 49.5 50

 Source: So Ill / Absolute

Absolute Confidence

We are experts on shoe sizing and are confident in the information we have provided because we:

Tick  Have been selling shoes in our Sports Shop for years.

Tick  Carefully research sizes for every brand we sell.

Tick  Are very proud of our extremely low returns rate.

Tick  Have been selling footwear online since 2004.

How to Measure Your Mondo Size

The Mondopoint size of a shoe is the length of the shoe's insole measured in cm. To work out your size, the best way is to look it up on a pair shoes which fit you well or to measure the length of the insole on your best fitting pair of shoes. Remove the insole and measure, using a steal measuring tape, from the extreme tip of the toe to the extreme tip of the heel. The measurement will ALWAYS be exact to the nearest 0.5cm. You will never get 30.2 or 28.8; it will always be 30.0 exactly. This is your mondo shoe or boot size. Checkout this video to have Adam explain it all in plain English.  He is using a snowboard boot but the same principle applies to all footwear.

Still not sure what size to get?

Buy a few pairs to try at home. We offer:

Tick  FREE Delivery on most orders to most destinations.

Tick  Low Cost Returns within the UK.

Additional Help & Advice

Tick  Browse our Advice Centre for more buying guides.

Tick  Email any time.

Tick  Phone during normal Shop Hours

Tick  Visit our Mountain Sports ShopAddress