GURANTEED TO LEAK
I've been through THREE (3) of these.  They held air for a while and then began to leak air.  We tried everything to seal the inflation valve on each; nothing worked.  I would blow them up in the evening and by morning they had lost considerable air.  One even went completely flat on me.  This is a great idea for leg inflation, BUT, due to a design flaw, the valve leaks air.  Buy at your own risk.  I suggest you read all the one star reviews.
Rating: 1 stars