A cap toe strap wraps over the front of your boot like a hood, pulling down and slightly back rather than just pressing straight down on top of your foot. This design is the most popular on modern bindings because it locks your heel firmly into the heel cup while keeping pressure off the top of your foot—so you get a secure hold without that numb, pinched feeling that older straps can cause.
Cap straps also help reduce toe drag, which is when your boot or strap hangs over the edge of the board and catches in the snow during carves. Since the strap cups the toe box instead of sitting on top, it sits lower and more out of the way.
For most riders—whether you're cruising groomers, hitting the park, or riding powder—a cap strap is the way to go. It's the standard for good reason: better hold, more comfort, and less drag. Just make sure it's seated properly over your toe box each time you strap in.