Fact? Fiction? ¯\_(ツ)_/¯
I have these and they are great for wet/snow conditions. You also don't ruin the carpet when putting stuff in the back.
Honda All-Season Floor Mats - High Wall (Passport)
Thought Sendbeta was inquiring about Rear cargo area covers . . .Check out the WeatherTech floor liners. Provides much more protection, and a nice clean custom fit.
I store and use a few cheap $3.99 Harbor Freight black moving blankets as cargo covers, or to protect the wheel-well 'fuzz' during load carrying, and to drape over the rear bumper to protect it from scary scratch serpents.