Protective helmet

A helmet, comprising:

• a generally round shell, said shell comprising a plurality of substantially flat mount surfaces, one of said mount surfaces on each side of said shell, each of said substantially flat mount surfaces comprising a fastener hole shaped to receive a fastener;
• and
• a generally curved translucent visor releasably fastened to the front of said shell, said visor comprising first and second end regions, each of said end regions comprising a substantially flat portion configured to align with a corresponding one of said mount surfaces of said shell, each of said end regions further comprising an access hole configured to align with said fastener hole of said shell such that said fastener is sunk with respect to said visor when said visor is fastened to said shell, allowing said substantially flat portions of said visor to sit flush against said substantially flat mount surfaces of said shell.