Abstract: A sport goggle and a system for ventilating a sport goggle is shown and described. The sport goggle has a strap, a lens structure, and a frame having a first edge extending laterally across the wearer's forehead. The first edge is shaped such that a portion of the first edge is curved in a concave up direction when the sport goggle is in a position of use, and such that, when the sport goggle is worn in combination with a helmet, one or more gaps are created between the first edge and a second edge on the front of the helmet. The first edge has a first opening located to allow air to flow into the goggle chamber. Increased goggle ventilation through the first opening can be caused by either the concave up portion of the first edge, or the gaps between the first and second edges.