I'm a big guy with a big head. So big that I have to look for big enough helmets. I have both the Giro models and the Bell models with the ear tips attached to the Giro. I usually ride in cold weather with a helmet cap and a beanie over my ears (like goggles over my ear). ) and these covers are in place. These things work GREAT! I hear road noise, including traffic approaching from behind, and I hear my Bluetooth speaker (steering wheel mounted), but the wind noise is gone. These things hold heat so well that I sometimes have to take them off or slide them down to let air in and my ears don't get overheated. I have used them when traveling in 17 degrees Fahrenheit. (-8 C) with a combination balaclava and skullcap (since the balaclava is not very big, I wear it to the back of my head and the skullcap does the rest). These earplugs are an absolutely essential part of my winter gear. I just wore a scarf on my head, this one over my ears and felt great on 40 degree days.
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