The Bell GP2 helmet offered here is a GP2 SFI241 Brus model in size 53 (Orange). The source provides the SFI241 V15 designation and size information so buyers can choose an orange GP2 helmet that matches certification expectations and head size for sanctioned racing events that reference the SFI 241 V15 level.
Bell GP2 SFI241 Brus Helmet - Size 53 (Orange)