Pinlock offers a fantastic solution against shield fogging. Fogging can easily occur because of the difference in temperature inside and outside your helmet and your moist breath.   Pinlock insert is made of a moisture absorbing plastic : surface basically dry when usedPinlock insert has a silicone seal : creates a double shield systemAir-tight pocket ensures that the difference in temperature becomes significantly loweredPinlock insert absorbs moisture on the inside and offers you continuous clear visibility