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The patented Aeorshell is a plastic cover that snaps into place over the helmet. It protects the rider from wind, rain, snow and mud while still allowing air to enter the helmet. Air enters the helmet at the front bottom part of the helmet and exits again at the back. The Aeroshell makes the helmet more aerodynamic by covering up the ventilation holes, turning every helmet into a cheap TT helmet. The Aeroshell can be removed while riding with just one hand. Snap it into place when it rains and pull it off once the sun starts to shine!