Michael Hanslip Coaching

If you want to go faster, you have to pedal harder

Smith Squad goggles

Traditional goggles fit the lens into the frame with several keyhole cutouts in the lens that slot up into the frame. It can be quite tedious to make them all fit in without feeling like the lens is going to fold in half.
Modern goggles all have some kind of quick install mechanism. Dragon uses a frame glued to the lens with pins that simply press fit into holes in the frame. Swapping lenses is so quick and easy. The 100% version locks the lens over the nose into a groove in the frame and then pulls the lens tight into the frame with "buckles" at the ends of the lens. Oakley has a similar latching mechanism too. The Smith Squad isn't quite a swiftly changeable as all that, but it is pretty close. The cutouts in the lens are few and large, and the ends of the lenses have hooks that drop into slots in the frame. It occasionally feels like the hooks might break off, but so far, so good in that regard.
The squad is unique in being a MTB specific goggle. Everything else is either a modified (or actual) MX goggle or a modified snow goggle. Thus where the MX goggles have foam over the vents to keep out the roost and dust, the Squad has open venting that allows much more airflow and therefore much less chance of fogging up. Really, to fog up a Squad lens requires stopping completely and standing around. The lack of foam is rarely irritating - small bugs can fly in for example, but is more often a good thing.
Smith's fancy coloured lenses are called ChromaPop. The lenses in these new-school goggles and glasses filter out the frequencies of light that cross-over between any two colour receptors in the human eye. By eliminating them, there is no confusion as to which sensors got stimulated. They can make colours look unnatural, but they do add depth perception and texture comprehension from this elimination of select frequencies of light. Within the ChromaPop label, there are numerous lighter and darker choices. I have two: a medium-dark rose tinted lens and a dark green tinted lens that cover most light conditions short of stormy or dark (which is when the clear lens included with the goggles works best).
They are good for picking out trail details.
They are easy on the eyes.

The rest of the goggle is good too. The foam rests lightly on the face. The strap is sticky enough to not move on the helmet. The lack of foam in the vents plays well with my contact lens wearing habits 99% of the time.
They are a touch small for my XL helmet-wearing self. That should be taken care of by the newer Squad XL option (which admittedly does me no good at all…).
ChromaPop options range from 12% transmission down to 65% transmission; plus clear which has 89% transmission. That covers most contingencies.

Really, goggles are about 2 things: do they fit and can you see?
These are comfortable and fit well in helmets with their slightly smaller sizing; taking care of point 1.
The moulded lenses (they aren't flat when removed from the frame) are usually higher optical quality than the flat ones and the ChromaPop colouring does highlight trail features well; taking care of point 2.

Highly rated in other words.