IMHO, and I'm radical pro gear, anything motorcycle is pretty much way overkill for the OneWheel. OneWheel is BMX/downhill trail bicycle at worst. I usually ride with this... Triple Eight THE Certified Sweatsaver Helmet for Skateboarding, BMX, and Roller Skating https://www.amazon.com/dp/B07Q7FV3XM/ref=cm_sw_r_apan_glt_fabc_8J132N775N0ZKHRJR6V6?_encoding=UTF8&psc=1

With this on my EUC... Bell Sanction Adult Full Face Bike Helmet https://www.amazon.com/dp/B07GT6M37D/ref=cm_sw_r_apan_glt_fabc_GRH035M4RGES9DW4CYS8?_encoding=UTF8&psc=1

Both are good quality helmets

I wear full gear; helmet, wrist guards, mesh jacket with integral forearm, elbow, shoulder, and spine padding, and kneepads.

WICKED STOCK Breathable All Seasons Mesh Motorcycle Riding Shirt for Men with CE (Certified) Protective Padded Shields (Black, XX-Large) https://www.amazon.com/dp/B082H4PGGP/ref=cm_sw_r_apan_glt_fabc_B0SD8Q335WRCYZRMM2GG?_encoding=UTF8&psc=1