Cold skin, every single flash.
Most at-home IPL fires into skin at room temperature and lets the heat sit there. The Verglas plate sits between the lamp and your skin and holds 43°F for as long as you keep working, so the pulse lands on skin that is already cold.
22°F colder than sapphire.
The leading sapphire plate in this category runs at 65°F. The Verglas runs at 43°F and stays there for the length of a session. That gap is the difference between a session you tolerate and one you finish.
Cooling that fades halfway through is the common failure. A plate that starts cold and warms up under use gives you a comfortable first pass and a wince by the fourth. Verglas holds its temperature through a full-body run.
Comfort is what finishes a course.
IPL works on a schedule. Two or three sessions a week to start, dropping to one by week four. The people who stop stop because it stings, usually around week three, usually on the underarm or the bikini line. Cold skin is how you get to week twelve.
Nine energy levels sit behind the plate. Cooled skin is what lets you hold a higher level week after week, and staying there matters more than any single session.
No gel. Nothing to freeze.
The plate chills itself as it fires. There is no cooling gel to buy, no gel pack to keep in the freezer, and no waiting between passes for anything to catch up.
Shave the area, put on the glasses, and start. The only consumable in this routine is the razor, and one comes in the box.