Protect a 6 inch air hose from physical damage
The best thing is to use rigid ducts instead of flexible ducts. A little harder to install as you have to figure out (and possibly do some cutting) exactly what pieces to use for your specific installation, and typically you need to attach several pieces together instead of one long tube. But avoids a lot of the issues of lint collecting inside every "crinkle" in the tube, tube getting easily crushed, etc.

Hopefully with rigid duct you can rearrange things so that you don't have ducts sitting right on top of the dryer (or other appliances).