The anti-fog protection on the Spy Raider Black / Red + Clear adult winter sports goggles will give you a superior optical experience so you can focus on what really matters and enjoy the slopes. Their Red lens features a VLT (Visible Light Transfer) rating of 13%, for a good performance on sunny days. An additional clear lens is included (for use in low-light conditions) allowing you to adapt to changing light. Those ski goggles are designed for medium to large fit and feature a silicone-lined anti-slip black strap.