Berghaus Yetis, but they were specifically designed for high altitude climbing, where the climbers wore plastic pebax shell boots, and wanted a gaiter that totally enveloped their boots, stopping the snow and water.
You could invest in full winter 4 season boots ,with a stiffened sole, but their hardly suitable for year round use.
It was a shame Berghaus did not develop a yeti gaiter for all round use, but the way they were designed would mean they would not fit a flexible boot.
I recon Berghaus must hold the sole copyright for the idea, as only one or two other company's have been allowed to copy the idea for a wider market, which is a real shame, as they are superb in keeping lots of mud and water away from the inside of your boots, and as we all know, thats a necessity in the warmer months.