If you have a more rounded back go for the KASK K31. It's deeper rear aero section is kinder to those whose head stays "up" or who's upper body positioning means that they struggle to find an aero helmet that sits right.
If you have a very flat back when riding and can hold your head still on the whole then go for the SPIUK with its more traditional pointy shape that "flows" along your back - coupled with the filled in base and superb aero venting.
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