We travel in the U.S. on business several times a year and we usually stay at 4-5 star hotels, but I'm absolutely paranoid about bed bugs, since I've heard they are on the rise in the U.S.  We also got a new mattress and I want to cut down on the possibility of dust mites.  This bed protector went on like a dream and fit my medium sized mattress and bed topper just fine.  Not too little (my last one fit my mattress so tightly it split at the zipper when I was trying to take it off) and not too big (there is no bagginess visible).  I'm very pleased with my purchase.