How to Size and Fit Kids Padded Bike Underwear (goUnders)

Make sure your goUnders fits correctly to get the comfort and protection you need. 

Supporting you and your family to SMILE when you ride.

Kids goUnder Sizing Information 

Please take your time, measure twice and read carefully.  If you’re still not sure simply contact us
021 025 15576, 0800 443377 or email,

All our Kids goUnders are unisex and are designed to fit the age range of 3 to 10yrs+

The best way to measure is with a tape measure.  If you don’t have a tape measure use a piece of string or some wool then lay this out along a ruler.

How to find the waist.  To find the natural crease line of a waist stand straight with hands at the side.  Then bend sideways running the hand down the outside surface of the leg.  This movement will produce a crease at the waist so place your measuring tape on this crease.  Return to standing straight and place the measuring tape around the waist, keeping it even all the way around.

How to find the hips.  Take your second measurement at the hip approximately 9 – 12cm for kids down from the waist (you are looking for the widest part of the body).

See the size charts to help with choosing the most comfortable size. If your measurement falls between sizes think about what this product is meant to do – hold a chamois in place – so you should go for a size that will be snug.  

Take your time and measure well but be reassured that we love returns because we want you to have the solution that is right for YOU so if you have to send it back it’s no problem at all . See returns

Make sure when you try on your goUnders for the first time you wear some underwear to protect the surface of our chamois.  Once you are happy with the fit it is yours to wear against your skin.  To get the best possible position for your chamois hold your goUnders at the front & back, not the sides as you pull them on.

get Ready, be Comfortable and you will find your riding SMILE 
XS (Xtra small)
Waist Mesurement)
Hip Measurement
Estimated Age Range
S (Small)
Waist Mesurement)
Hip Measurement
Estimated Age Range
M (Medium)
Waist Mesurement)
61-64 cm...
Hip Measurement
Estimated Age Range
8-10 years
L (Large)
Waist Mesurement)
64 - 68cm
Hip Measurement
Estimated Age Range
10 plus years

Kids goUnders Fit


There are different types of waistbands on different types of padded bike pants.  One particular style of waistband may suit you better than another.  For example a fabric waistband can be more comfortable than an elastic waistband for some body shapes.  Consider the height of the waistband and how it feels

  • check that the band or elastic is not too tight or pinching in
  • as you bend forward does the waistband slide too far down your back

As you go up in size the waistband will increase in diameter and will sit on your body at a higher point.


The padding/chamois should feel like it is being held in place, not sliding around or hanging/dragging down at the back.  It will feel a little odd between your legs but it should not restrict your movement in any way.  At the front it is designed to protect your pubic bone as you lean or tilt forward on your bike seat.  At the back the chamois is shaped to provide padding & support under your sit bones.

The idea is to get the right amount of compression/stretchy tightness in the bike pants fabric to hold the padding (chamois) in place without it being uncomfortable to move.  So do a bit of jiggling around, moving your legs, bending forward, going into a squat position – what does all the moving do to the position of your padding?  It should be held in place.


Again it is important that the leg area of your padded bike pants is not too tight.  You should be able to move freely with no restriction or pulling from seams or hems.  Some riders who spend a lot of time on the bike and do a lot of moving up & out of the seat, changing position when reacting to the terrain, like to have elastic grippers around leg bands to hold their pants firmly in place.

Your leg band or hem should not restrict movement.  Check this by moving the part of your body that the band is closest to.  For 3/4 pants (capris) rise up and down on your toes to move your calf muscles & also bend at the knee joint.


Check the waistband is firm but does not pinch

Check the riding length and the leg is not too tight.

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