With my Curt receiver and current mount there was not enough space for this tightener. I purchased size medium for my size 7 wide feet and they fit very well, a bit roomy but the next size down would be too small. The majority of the time they stay on and dont roll down under my foot. This took a little time to assemble, roughly an hour, but I’m very satisfied with it and it seems to be very sturdy and it holds my shoes! Nowadays I do a lot of hiking in a wet, rocky place. They fit well over the top of my foot, but were slightly boxy in the toe box. They just secure the bag side to side / front to rear. The touch sensitive control on the right bud is pretty sensitive and thats taking some getting used to, but now I really like it. I had originally wanted to get a over the door coat rack that I had ordered last year for another door in my house Im an aside this one I thought why not give it a try actually its better than the 1 I bought originally a shady just really Felt dumb because I like this one so much better theres nothing wrong with the other ones then I bought but this 1 actually meets the perfect knees for what I want I wanted something to keep my stuff higher off the floor and not hang so low on my door so this 1 Both of them now want a pair of these headphones and are saving there allowance to do so!