L is for layers.Wearing loose, lightweight clothes, one layer on top of another, is better than wearing a single heavy layer of clothing.

VOA: special.2009.12.23

We changed our name just last week after the acquisition of Top Layer by Corero.

FORBES: DDoS Defense: Preventing business disruption

The top layer contains hundreds of control channels through which pressurized water is pumped.

FORBES: Science Beyond Belief

Some particles, however, are energetic enough to puncture the top layer and strike the second layer.

ECONOMIST: Orbital debris