Like I mentioned earlier, a fit helmet will be more comfortable than an unfit helmet. So of course, you should take your time to select the size of the helmet. If you already know your head shape and size, way to go! And if you don’t, take a minute and measure your head size first, it will help drastically.
For this FX-41 DS helmet, it comes in 2 shell sizes and 4 EPS sizes, which is a great feature to find in a budget helmet. So, you have a bunch of choices here and there are the cheek pads and additional paddings in case you need any adjustments.
And as for the inner shape, it’s an Intermediate Oval shape but it’s more like something between round oval and intermediate oval. However, it’s gonna fit you just fine if you have an intermediate oval head shape, like the majority of the riders out there.