I purchased a Pioneer MX436 last week. It's the 2nd LS2 helmet I have purchased over the years. My head measures 61cm which put me at the low end for the XL. While the top of the helmet fit is tight but manageable, the cheek pads are so tight it is bordering on painful. I have not yet decided whether to return for refund of swap to a larger 2XL size. I'm wondering if the XL and 2XL use the same shell or simply use different cheek pads.