Difficult to put on, keeps collapsing while I am drying my hair. [SEP] I have curly hair and thought it was time to buy a diffuser attachment for my hairdryer. I measured the mouth portion of my hairdryer before I purchased this. It said a 2" opening would be a good fit. It was extremely difficult to put on over my hairdryer. Well, after using some creativity, lots of finger and hand muscle and a bit of frustration I stretched it over the hairdryer opening. Then while using it, it collapsed several times while I was drying my hair. This was even more frustrating than putting it on the hairdryer itself! I still may return it, I usually air dry my hair. I do not recommend unless you need for travel and have no better option.