I love my Nutcase Watermelon helmet; it’s the one I wear all winter long. At a bike expo last year, I bought a brim for it.
The brim seemed like a silly idea: How could something so small make such a difference? It did, as it turns out; it blocks just enough light, and is kind to my eyes.
The brim is just friction-fit to the helmet. Over time, the slot appears to have widened, and the brim now has a tendency to slip out at inopportune moments.
I’ve actually found it on the ground a couple of times, when carrying the helmet. That’s not good.
Apparently, the styrofoam inner shell is compressing a bit, widening the gap into which the visor friction-fits. That’s not a particularly cheering thought, though I suppose the square-inchage (so to speak) involved is pretty small.
I’m loath to use an adhesive to hold the brim in place; that could do a really nice job of neutralizing the foam shell. Maybe Nutcase will come up with a better solution? I’d like that — I’m quite used to the brim, and will miss it if it disappears one day.