Yesterday, being the hottest day of the year so far, I decided to scrub out the inside of my trailer. I pulled the mats, they are in 4 sections, like puzzle pieces, washed inside, outside, etc. Laid the mats out on the lawn & washed them too. A few hours later, when everything is bone dry and starting to bake in the sun, I put the mats back in, they are not fitting. They fit before when I have removed them, lots of time too, however this time they seem too big, lovely. Me thinks the heat expanded the rubber? You bet, this morning before I hooked up to go to lessons, the mats shrunk and could be easily maneuvered into position. All the other times I had taken them out, it wasn't as hot as this outside. So if you planning on going anywhere as soon as your trailer & mats are dry in the heat, don't count on getting your trailer door closed, the mats are too big!