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 Sidas

We want you to be able to find the correct Sidas size quickly and easily. Here you will find measurements and international conversions for footwear and accessories converted into standard UK sizes. We have included information taken directly from Sidas to ensure the most up to date and appropriate sizing is used. We have made sure the information for Men's and Women's products is accurate and listed them in the size charts below. If the information you are looking for isn't available, please feel free to contact us.

 

 

 

When purchasing footwear from Sidas, we strongly recommend using the 'Mondo' measuring system, rather than your normal shoe size. The Mondo scale is dead easy! Mondo 30.0 means the footbed liner or insole of your shoe is exactly 30cm long. Some manufacturers call it Mondo 300 but this simply means your insole is 300mm long so is exactly the same.

The mondo point scale was invented in Japan so it is sometimes also referred to as Japanese sizing. To work out what shoe size you need using the mondo scale, simply find a pair of boots, trainers or shoes that fit you well and either look at the MP size quoted on the size label or remove the insole. Measure the insole using a steal measuring tape measuring from the extreme tip of the toe to the extreme tip of the heel. The measurement will ALWAYS be exact to the nearest 5mm. You will never get 30.2 or 28.8. It will always be 30.0 exactly. This is your mondo shoe or boot size. This is the standard footwear conversions for Mondo, UK, USA and EU for both men and women.

PLEASE NOTE - All footwear is listed in UK sizes on our site. 

 

Sidas Regular & Heated Insoles 

Please see below for men's and women's Sidas insole sizes in UK, EU and US and Mondo conversions.


Sidas Men's and Women's Insole Size Chart

Mondo (mm) Size EU  US  UK 
 220 XS 35-36  3-4 2-3
 225 XS 35-36  3-4 2-3 
 230 XS 35-36  3-4 2-3 
 235 S  37-38  5-6 4-5 
 240 S  37-38  5-6 4-5 
  245 S  37-38  5-6 4-5 
 250 M  39-41  7-8 6-7
 255 M  39-41  7-8 6-7 
 260 M  39-41  7-8 6-7 
 265 M  39-41  7-8 6-7 
 270 L  42-43  9-10 8-9
 275  L  42-43  9-10 8-9
  280 L  42-43  9-10 8-9
 285  XL  44-45  11-12 10-11
 290  XL  44-45  11-12 10-11 
 295  XL  44-45  11-12 10-11
 300  XXL  46-48  13-14  12-13
 305  XXL  46-48  13-14 12-13 
 310  XXL  46-48  13-14 12-13 

Source: Sidas

Found the right size? Shop Sidas here. 

 

Sidas Boot Liners 

Please see below for men's and women's Sidas boot liner sizes in Mondo conversions.

 

Sidas Thermoformed Boot Liners Size Chart

Mondo (mm) Size UK Unisex EU Unisex
 230 D 4 37
 235 D 4.5 37.5
 240 E 5 38
  245 E 5.5 38.5
 250 F 6 39
 255 F 6.5 40
 260 G 7 40.5
 265 G 7.5 41
 270 H 8 42
 275  H 8.5 42.5
  280 I 9 43
 285  I 9.5 44
 290  J 10 44.5
 295 J 10.5 45
 300 K 11 45.5
 305 K 11.5 46

 

Sidas PU Boot Liners Size Chart

Mondo (mm) Size UK Unisex EU Unisex
 220 C 3 36
 225 C 3.5 36.5
 230 D 4 37
 235 D 4.5 37.5
 240 E 5 38
  245 E 5.5 38.5
 250 F 6 39
 255 F 6.5 40
 260 G 7 40.5
 265 G 7.5 41
 270 H 8 42
 275  H 8.5 42.5
  280 I 9 43
 285  I 9.5 44
 290  J 10 44.5
 295 J 10.5 45
 300 K 11 45.5
 305 K 11.5 46
 310 L 12 47
 315 L 12.5 47.5

Source: Sidas

Found the right size? Shop Sidas here. 

 

 

Sidas Heated & SynergyFit™ Socks

Please see below for Men's and Women's Sidas sock sizes in Mondo conversions.


Sidas Men's and Women's Heated Sock Size Chart

Mondo (mm) Size UK Unisex EU Unisex
 220 Small 3 36
 225 Small 3.5 36.5
 230 Small 4 37
 235 Small 4.5 37.5
 240 Small 5 38
  245 Medium 5.5 38.5
 250 Medium 6 39
 255 Medium 6.5 40
 260 Medium 7 40.5
 265 Large 7.5 41
 270 Large 8 42
 275  Large 8.5 42.5
  280 Large 9 43
 285  X Large 9.5 44
 290  X Large 10 44.5
 295 X Large 10.5 45


Sidas Men's and Women's SynergyFit™ Sock Size Chart

Mondo (mm) Size EU  US  UK 
 220 XS 35-36  3-4 2-3
 225 XS 35-36  3-4 2-3 
 230 XS 35-36  3-4 2-3 
 235 S  37-38  5-6 4-5 
 240 S  37-38  5-6 4-5 
  245 S  37-38  5-6 4-5 
 250 S/M  39-40  7-7.5 6-6.5
 255 S/M  39-40  7-7.5 6-6.5
 260 M/L  39-40  7-7.5 6-6.5
 265 M/L  39-40  7-7.5 6-6.5
 270 L  42-43  9-10 8-9
 275  L  42-43  9-10 8-9
  280 L  42-43  9-10 8-9
 285  XL  44-46  11-13 10-12
 290  XL  44-46  11-13 10-12 
 295  XL  44-46  11-13 10-12
 300  XL  44-46  11-13  10-12
 305  XXL  47-49  13.5-14.5 12.5-13 .5
 310  XXL  47-49  13.5-14.5 12.5-13.5
 315  XXL  47-49  13.5-14.5 12.5-13.5 

Source: Sidas

Found the right size? Shop Sidas here. 

Sidas SynergyFit™ Guide

Sidas SynergyFit™ Socks come in a number of different 'thicknesses'. Check the product description on the item to see which fit applies.

  • ULV Ultra Low Volume: This is a very thin design, giving you a "second skin" effect.
  • LV Ultra Low Volume: This is a thin design, ideal for narrower ski boots.
  • MV Medium Volume: Medium thickness, ideal for all ski boots. 

 

Sidas Sandals & Flip Flops 

Please see below for men's and women's Sidas sandal and flip flop sizes in UK, EU and US and Mondo conversions.

 

Sidas Men's and Women's Sandals & Flip Flops Size Chart

Mondo (mm) UK Unisex EU Unisex
 225 3-4 36-37
 230  3-4  36-37
 235  3-4  36-37
 240  5-6  38-39
 245  5-6  38-39
 250  5-6 38-39
  255   6.5-7.5  40-41
 260 6.5-7.5  40-41
 265  8-9 42-43
 270  8-9  42-43
 275  8-9  42-43
 280  9.5-10.5  44-45
 285  9.5-10.5  44-45
 290 9.5-10.5  44-45
 295  11.5-12  46-47
 300  11.5-12  46-47

Source: Sidas

Found the right size? Shop Sidas here. 

 

 

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