Smith Mission Helmet Question

[RShea]

So shopping and looking at new Ski and Snowboard helmets for the season. I am seeing the Smith Mission series in MIPS model and a second that is labeled as Koroyd core - so they are 2 different construction models? Or both MIPS and some difference like the year the models were released?

[whyturn]

Koroyd is a newer lighter MIPS material and is not a foam It does change fit a little and warmth IMO since it vents better than foam Fit is subjective and may be more a case of helmet model


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[caulfield]

Koroyd and MIPS are independent of each other. MIPS is the slip layer that (in theory) absorbs some energy by rotating on impact. Koroyd is a version of the "normal" helmet thing--straight on energy absorption. It's like a plastic honeycomb. I dunno what's going on with the different models of Mission. Sometimes Smith appends MIPS to the MIPS models, sometimes not. Either they have a couple models at different price points, or its a generation thing like you said. Effectiveness of helmet stuff is hard to prove, just buy what fits and has the tech/price that you're comfortable with.

[FullStop]

Mine has MIPS and Koroyd. Great helmet but it fits quite a bit different than the Code for example.

[RShea]

Koroyd is a newer lighter MIPS material and is not a foam It does change fit a little and warmth IMO since it vents better than foam Fit is subjective and may be more a case of helmet model


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The Koroyd fit is different than the Standard Foam Mission that I had stuck my head into before when trying them on. The MIPS Mission that is all foam and traditional construction I fit in a Medium (55 to 59 cm) Most all the helmets I've owned I based on 58 cm for both Bike and Skiing over the years. (Since even companies like Smith and Giro have some medium helmets that are 54-58 cm and then some of their other models the 57-59 cm is a size large)...
A skiing acquaintance that I know had one of the Smith Mission Koroyd listed - new with tags on FB Marketplace in a size Large. I met up with him and tried it on and end up buying it off him. It was a Large and 59-63 cm I believe (it's in the car right now)

Here are the Smith sizes to confuse you based on the shape, series (race or not, etc.):
M 55-59cm
Round Contour Fit M 59-63cm
L 59-63cm

The structure is sort of like a honeycomb plastic and not the full foam... (Maybe I'll shoot a few photos and upload them later.)