Sparco RW-4 Fire Resistant Racing Boxers Size:X-Large Internal Fire Button is compatible

Internal Fire Button is compatible with SPA Electric Fire Systems

2a/5 fire resistant standards

and M3 helmets equipped with the SRV-style pivot (non-detent)

When using the Top Forced Air Induction on your Bell BR-1 Helmet

Sparco RW-4 Fire Resistant Racing Boxers Size:X-Large Internal Fire Button is compatibleSparco's entry level RW 4 line of underwear is optimized for both comfort and protection while maintaining a budget price. Although not FIA or SFI approved due to their short length, fire resistant boxer shorts are great for adding protection on hotter days when rated protection is not needed. Using Sparco's classic soft touch fire resistant fabric, the regular fitting shorts are comfortable for all body types and offers excellent breathability.