These can be used on the MTB, however the toe only style is very subjective moving around as they have an open sole design. But if gravel rides are you goal @trener1, wont be an issue. I have these and i use them into the high 30's on the road. Below that is bootie time.I just picked these up, should have them tomorrow...
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http://www.pearlizumi.com/US/en/Sho.../Covers/Elite_Thermal_Toe_Cover/p/14381006021
There is a strong difference between road and mtb booties.