Last time I measured my head, I came back with a 59 cm diameter. That puts me squarely in the large Abus HiDrop, which fits me well. I'm on the top end of medium for most helmet brands, and I hate too-big, loose helmets, but luckily the large HiDrop has a comfortable, secure fit on my head.
The Abus HiDrop uses an ABS outer shell padded with an EPS and EPP core. Notably absent is any kind of rotational impact technology, Mips, or otherwise. The HiDrop does feature a breakaway, one-position visor.
My big gripe with most breakaway visors is that they often break away when they don't need to. Yes, it's important to make the helmet rounder and less likely to get caught in a crash, but I've had too many visors pop off in the car or when I'm hiking with the helmet on my back.
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