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(Source) General Bicycle Helmet vs

With nothing but stars above I slept hard for a few hours before getting up and on the trail again

The helmets with dual certification

This setup, seen on models like the Osprey Exos 58 and Zpacks Arc Haul UltraEPX, allows air to circulate more freely, though in some cases it can slightly affect stability and lead to the dreaded pack sway. On the other end of the spectrum are packs that dont modify the backpanel at alllike the Hyperlite Southwest 55, which simply continues its Dyneema construction across the backresulting in minimal ventilation

The interior lining is removable and washable, maintaining hygiene and comfort easily