B-TR Blue Tech MaskOne Size Fits All Features adjustable comfortable and soft stretch bands on the back to hold the head in place Led Lights The mask has an easy on and off switch that allows for the mask to light up with a cool blue light in a triangle Fog Prevention Our ABS plastic material allows the mask to not fog up unless in very cold weather Clarity The mask is made to be like seeing through sunglasses and there should be no problems seeing Breathability Mask