no need for new ones just turn them inside out!
That is how I travel so light - half as much weight - and color coordinated too.
Bose makes a headphone for pilots (150 miles past the destination?) that selectively filters out ambient noises and allows other sounds through without change.
I know that this system works; some would like to be able to choose what is filtered.
Not inexpensive, but another thought.
We have digressed from the freezing rain subject, which reminds me of a device on a car I once owned, and on a few coaches also - a sensor that is made by VDO, and I imagine a few other gauge manufacturers, that attaches behind the front bumper and measures the temperature of the road, giving a dash mounted visual warning of freezing conditions under the vehicle. I have added one to each vehicle I drive to prevent the well controlled, free-style performance that initiated this thread.
My uncle, who drove for London Transport, told me that part of his training was to drive a double decker onto a section of wet pavement across which was diagonally strung a tight rope that caused the bus to go into a slide, and the trainees had to learn to handle the bus through the skid. I watched the video, and spinning one of those buses must be a wild ride. There are some pictures of the Chiswick facility at http://overground.doeth.net/chiswick/