Followed the instructions for putting together, but 2 tubes' tabs broke off upon assembly. (YES, let it sit overnight on the heater vent.) Apparently, the condo where we stayed was exceptionally well insulated and heater rarely kicked on making this useless....and still broken.  Nothing dried in 48 hours and they weren't exceptionally damp to begin with.  Thankfully, another shoe dryer took care of what we needed quickly. Tossed before packing to leave.