After my 6 year old outgrew her armbands, I researched all the reviews available and decided on BEMA. They fit really easily, are very easy to inflate and deflate - in and out of the water. Because they are triangular shaped, they are easy to put on and take off. My daughter has not complained about these - her previous ones always niggled her and felt uncomfortable whenever she wore them. Not these though - they are a well thought-out design. Well done BEMA!
I bought this product for my almost eight year old who is average size for her age. They are a snug fit and I doubt they would fit an average sized ten year old when fully inflated. However on a positive note they are very durable and inflate well as I have previously found with BEMA Armbands.