Not all sizes are universal
344277
I've had this product on my wish list for a while and finally purchased it for a friend. He's a large man so I purchased a 3XL. Unfortunately a 3XL in China is a large here so it didn't fit. It worked as a gag gift so for the price it was fine.
1619030
Length is great. However the width is way smaller than it should be. It's always a gamble buying clothes online even though you'd think all the same sizes would be universal.
3670996
Unfortunately the product does not fit any of the 7 different water bottles I have even though they all appear to be  "wide mouthed" bottles.  Buyers should beware that this will only work with a very specific type of bottle.  More disappointing was that for this return reason I am required to pay return shipping.  So I am out out at least $5 with nothing to show for it.

Free return shipping should be offered especially in a situation where the product is completely unused.
2107837
This is very good quality; however, the "Universal" in the name does NOT refer to the fit!  This was ordered for a large or elongated stool and didn't fit.  After much tugging and stretching it barely covered the outer edges.  Good quality but isn't "universal".
2706259
One size does not fit all. I wear a small and it does not fit!
959041
Have variances in size on the couple that I bought. Some darts would work in one, but not the other
998488
I have been having a hard time finding one that will fit. This fits better and than any I have brought, but still not the exact one like the one I had
1307470
It not very universal,  can not fits my knife and it's hard to place the knife on the holder.
3845097
Nice that these can be used on several different sizes, but they are a bit tough to get on smaller cans.
1773400
It is definitely not universal. We have two pretty standard kayaks and it is too small for one and too big for the other (scrunches up and doesn't "seal"). Will be returning it unfortunately.
18708
Just so everyone knows, They are NOT universal! I had to get a screwdriver and make the inside wider so it could fit. I made it work and it looks really nice
495531
NOT universal size.. even on the 4inch side.. it does NOT cover a standard 4in dryer vent opening.
It's not worth taking or sending back.. but I had to rig it up to fit over my vent and even remotely cover up the part where birds were getting in.
2440288
Be careful of sizes, if you're ordering a universal size look up the foot length and compare it to the sizing you're familiar with.
4209925
Nice quality, structure, fabric, etc. However, I went thru 2 sizes and both didn't fit. I ended up returning both, I'm not going to purchase a 3rd time. Realize now that this is something that needs to be tried on in store before purchase.
2536452
These are NOT one size fits all.  Its a very weird fix.  Not worth it at all.  Does not fit well.
2762463
I did not think that these items come on different sizes.
It was too small.  The dimensions were not shown by arrows in the display.
3615114
They are not universal fit.  Quality is good but check fit.