Ultra is available in the sizes S, M-L and XL, and all have an adjustment system to adjust the tension.
Size S: 51 - 55 cm (20 - 21.6 inch)
Size M-L: 54 - 61 cm (21.3 - 24 inch)
Size XL: 61 - 65 cm (24 - 25.6 inch)
Adding MIPS to your Ultra helmet does not impact its size, thanks to the MIPS/retention system integration that we're utilizing for Ultra.
It's a simple task to measure your head size. Grab a measuring tape and place it around your head, mid-forehead just above your ears. Make sure you keep it leveled and read the cms/inches. For reference you can watch the video below.
What if I am between sizes?
Borderline between M/L and XL
If your head is 61.0 cm or less, we recommend you go with the M/L size.
If your head is > 62.0 cm, we recommend you go with the XL size.
If your head is in-between 61.0 - 62.0 cm, this is a little tricky and a bit of a toss up. M/L could fit you, but XL is probably the safer bet.
Borderline between S and M/L
If your head is 55.0 cm or less, we recommend you go with the S size.
If your head is > 55.0 cm, we recommend you go with the M/L size.
If you have a relatively wider head, or are between sizes, we suggest you to try it at a store before you buy it if possible.
If you purchase from our website (lumoshelmet.co) we have a returns policy where you can get a full refund within 30 days. Just keep your packaging and note that you'll have to pay for return shipping. You can find our return procedure here.
How to get the right fit?
To get the right fit for your helmet, you can read this article or checkout this video: