The Giro website doesn't help very much when it comes to sizing. I found tht I fit nicely into a Large Fuse or a Medium/Large Omen.
MBStores has a good size chart and it shows the Fuse at 14.5 oz.
| Model Name | S | M | L | XL | XXL |
| Fuse | 53.5-55.5cm | 55.5-57cm | 57-59cm | 59-60.5cm | 60.5-62.5cm |
In terms of pricing at the end of this season, the list price is $320 at Amazon, but you can find it on eBay for $150 thanks to Mpire just be careful to get the wireless version, they have three versions, no audio, wired audio (called tuneup ii) and wireless (called wireless tuneup).
At REI there is the sizing information for the new top of the line Giro Omen, it is a little simpler as it has three sizes only that Snowshack has
| Model | XS/S | M/L | XL/XXL |
| Omen | 52-55.5cm | 55.5-59cm | 59-62.5cm |
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