Color helps block sun but can see in all lighting. Didn't fit the googles we got them for though.
My 6.5 yr old son has been using the Fly Focus goggles for a few years now and loves them. This particular focus lense comes with Tear off posts. We always run at least one tear-off and it preserves the life of the lenses significantly. My little guy really likes the yellow lenses; very easy to make out the track / trails.
There have been no questions asked about the Fly Racing Youth Focus / Zone / Zone Pro Anti-Fog Lens.